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Raman spectra of diphenylalanine microtubes: polarisation and temperature effects / A. Krylov, S. Krylova, S. Kopyl [et al.] // Crystals. - 2020. - Vol. 10, Is. 3. - Ст. 224, DOI 10.3390/cryst10030224. - Cited References: 43. - This research was funded by the Russian Foundation for Basic Research grant number 18-02-00754, F.S. thanks Scientific and Technological Research Council of Turkey for support under Grant Number 115F227. S.Kopyl and A.Kholkin thank the joint project Portugal-Turkey TUBITAK/0006/2014. This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, refs. UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the FCT/MEC. S.Kopyl, P.Z. and A.Kholkin were partly supported by FCT (Portugal) through the project "BioPiezo"-PTDC/CTM-CTM/31679/2017 (CENTRO-01-0145-FEDER-031679). Part of this work was funded by national funds (OE), through FCT-Fundacao para a Ciencia e a Tecnologia, I.P., in the scope of the framework contract foreseen in the numbers 4, 5, and 6 of the article 23, of the Decree-Law 57/2016, of 29 August, changed by Law 57/2017, of 19 July. . - ISSN 2073-4352

РУБ Crystallography + Materials Science, Multidisciplinary
Рубрики:
PIEZOELECTRIC PROPERTIES
   PHASE-TRANSITIONS
   SPECTROSCOPY
   SCATTERING
Кл.слова (ненормированные):
diphenylalanine -- Raman spectra -- phase transition -- polarisation -- temperature effects
Аннотация: Diphenylalanine microtubes have remarkable physical properties that allow one to use them in electronics. In this work, we measured polarised temperature-dependent Raman spectra in self-assembled diphenylalanine microtubes grown from the solution. We observed the anomalous temperature behaviour of the Raman lines. Their temperature changes were minimal, which required a significant improvement in the resolution and stability of Raman measurements. The anomalies in the behaviour of the spectra at about 178 K, 235 K, 255 K, 278 K, 296 K, 398 K and 412 K were observed. The structural phase transition at 398 K is irreversible. This transition is associated with the release of water molecules from nanochannels. The irreversible phase transition has a temperature range of about 10 K.

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Держатели документа:
Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Univ Aveiro, Dept Phys, P-3810193 Aveiro, Portugal.
Univ Aveiro, CICECO Mat Inst Aveiro, P-3810193 Aveiro, Portugal.
Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Russia.
Istanbul Tech Univ, Dept Phys Engn, TR-34469 Istanbul, Turkey.
Ural Fed Univ, Inst Nat Sci & Math, Ekaterinburg 620026, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Kopyl, Svitlana; Salehli, Ferid; Zelenovskiy, Pavel; Vtyurin, A. N.; Втюрин, Александр Николаевич; Kholkin, Andrei; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-02-00754]; Scientific and Technological Research Council of TurkeyTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [115F227]; project Portugal-Turkey [TUBITAK/0006/2014]; FCT/MEC [UIDB/50011/2020, UIDP/50011/2020]; FCT (Portugal) through the project "BioPiezo" [PTDC/CTM-CTM/31679/2017 (CENTRO-01-0145-FEDER-031679)]; national funds (OE), through FCT-Fundacao para a Ciencia e a Tecnologia, I.P.
}
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Effect of calcination temperature on activity of Fe2O3-Al2O3 nanocomposite catalysts in CO oxidation / A. M. Kremneva, A. V. Fedorov, O. A. Bulavchenko [et al.] // Catal. Lett. - 2020. - Vol. 150. - P. 3377-3385, DOI 10.1007/s10562-020-03250-8. - Cited References: 31. - This work was supported by the Russian Science Foundation (Grant No. 17-73-20157). The experiments were performed using facilities of the shared research center "National center of investigation of catalysts" at Boreskov Institute of Catalysis. The authors thank A.Yu. Gladky for the TPR measurements and Z.S. Vinokurov for the XRD measurements. . - ISSN 1011-372X. - ISSN 1572-879X

РУБ Chemistry, Physical
Рубрики:
MOSSBAUER
   SPECTROSCOPY
   CHEMISTRY
   IRON
   XPS
   ADSORPTION
   OXYGEN
   FE
Кл.слова (ненормированные):
Environmental catalysis -- Nanostructure -- Gasification -- Oxidation -- Mossbauer spectroscopy
Аннотация: Nanocomposite Fe–Al oxide catalysts were prepared by the melting of iron and aluminum nitrates with the subsequent calcination in air at different temperatures. It was found that the catalysts calcined at 450 °C are more active in the oxidation of CO than the catalysts calcined at 700 °C. X-ray diffraction and X-ray photoelectron spectroscopy showed that all the catalysts consist of hematite, α-Fe2O3 nanoparticles, and Al2O3 in an amorphous state. Iron oxide is the active component, which provides the oxidation of CO, while alumina is a texture promoter. The increase in the calcination temperature leads to a minor increase in the average size of hematite nanoparticles and an insignificant decrease in the specific surface area. Kinetic measurements showed that the oxidation of CO over the Fe–Al catalysts calcined at 450 and 700 °C proceeds with the activation energy of 61–69 and 91 kJ/mol, respectively. This means that the low-temperature and high-temperature catalysts contain different active species. Temperature-programmed reduction with CO indicated that the decrease in the calcination temperature improves the reducibility of the Fe-Al nanocomposites. According to 57Fe Mössbauer spectroscopy, the low-temperature catalysts contain hydrated iron oxides (acagenite and ferrihydrite) and a significant amount of highly defective hematite, which is absent in the high-temperature catalyst. These species can provide the enhanced activity of the low-temperature catalysts in the oxidation of CO.

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Держатели документа:
Boreskov Inst Catalysis, Novosibirsk 630090, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Kremneva, A. M.; Fedorov, A. V.; Bulavchenko, O. A.; Knyazev, Yu. V.; Князев, Юрий Владимирович; Saraev, A. A.; Yakovlev, V. A.; Kaichev, V. V.; Russian Science FoundationRussian Science Foundation (RSF) [17-73-20157]; National center of investigation of catalysts" at Boreskov Institute of Catalysis
}
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Core-hole localization and ultra-fast dissociation in SF6 / V. Ekholm, G. S. Chiuzbaian, C. Sathe [et al.] // J. Phys. B. - 2020. - Vol. 53, Is. 18. - Ст. 185101, DOI 10.1088/1361-6455/aba204. - Cited References: 36. - This work was supported by the Swedish Research Council (VR). The calculations were performed on resources provided by the Swedish National Infrastructure for Computing (SNIC). FG acknowledges support within the Russian Science Foundation (Project No. 16-12-10109) . - ISSN 0953-4075. - ISSN 1361-6455

РУБ Optics + Physics, Atomic, Molecular & Chemical
Рубрики:
X-RAY-EMISSION
   SYMMETRY-BREAKING
   AB-INITIO
   SPECTROSCOPY
   SPECTRA
Кл.слова (ненормированные):
SF6 -- resonant inelastic x-ray scattering -- symmetry selection rules -- ultrafast dynamics -- vibronic couplings
Аннотация: Resonant inelastic x-ray scattering spectra excited at the fluorine K resonances of SF6 have been recorded. While a small but significant propensity for electronically parity-allowed transitions is found, the observation of parity-forbidden electronic transitions is attributed to vibronic coupling that breaks the global inversion symmetry of the electronic wavefunction and localizes the core hole. The dependence of the scattering cross section on the polarization of the incident radiation and the scattering angle is interpreted in terms of local π/σ symmetry around the S–F bond. This symmetry selectivity prevails during the dissociation that occurs during the scattering process.

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Держатели документа:
Lund Univ, MAX IV Lab, Box 118, SE-22100 Lund, Sweden.
Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden.
Sorbonne Univ, F-75005 Paris, France.
CNRS, LCPMR, F-75005 Paris, France.
Synchrotron SOLEIL, LOrme Merisiers, BP 48, F-91192 Gif Sur Yvette, France.
Ctr Nacl Pesquisa Energia & Mat CNPEM, BR-10000 Campinas, Brazil.
Royal Inst Technol, Sch Biotechnol, Theoret Chem & Biol, S-10691 Stockholm, Sweden.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden.

Доп.точки доступа:
Ekholm, V.; Chiuzbaian, G. S.; Sathe, C.; Nicolaou, A.; Guarise, M.; Simon, M.; Jaouen, N.; Luning, J.; Hague, C. F.; Gel'mukhanov, F.; Гельмуханов, Фарис Хафизович; Odelius, M.; Bjorneholm, O.; Rubensson, J-E; Swedish Research Council (VR)Swedish Research Council; Russian Science FoundationRussian Science Foundation (RSF) [16-12-10109]
}
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Electronic band structure and superconducting properties of SnAs / P. I. Bezotosnyi [et al.] // Phys. Rev. B. - 2019. - Vol. 100, Is. 18. - Ст. 184514, DOI 10.1103/PhysRevB.100.184514. - Cited References: 45. - The authors thank E. Z. Kuchinskii and M. V. Sadovskii for valuable discussions. This work was performed using equipment of the LPI Shared Facility Center and the resource center "Physical methods of surface investigation" (PMSI) of the Research park of Saint Petersburg State University. V.M.P. acknowledges Russian Foundation for Basic Research (RFBR) Grant No. 16-29-03330. P.I.B., K.A.D., A.V.S., K.S.P., A.V.M., A.S.U., A.Y.T., and S.Y.G. were supported within the state assignment of the Ministry of Science and Higher Education of the Russian Federation (Project No. 0023-2019-0005). A.G.R. acknowledges Saint Petersburg State University for research Grant No. 40990069. I.A.N., A.A.S., and N.S.P. acknowledge Russian Foundation for Basic Research (RFBR) Grants No. 17-02-00015 and No. 19-32-50001, the Program No. 12 of Fundamental Research of the Presidium of RAS. N.S.P. was also supported in part by the President of Russia grant for young scientists No. MK-1683.2019.2. . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
TOPOLOGICAL CRYSTALLINE INSULATOR
GAP STRUCTURE
SPECTROSCOPY
Аннотация: We report a comprehensive study of physical properties of the binary superconductor compound SnAs. The electronic band structure of SnAs was investigated using both angle-resolved photoemission spectroscopy (ARPES) in a wide binding energy range and density functional theory (DFT) within generalized gradient approximation (GGA). The DFT/GGA calculations were done including spin-orbit coupling for both bulk and (111) slab crystal structures. Comparison of the DFT/GGA band dispersions with ARPES data shows that the spectrum for the (111) slab much better describes ARPES data than that for the bulk. In addition, we studied experimentally superconducting properties of SnAs by specific heat, magnetic susceptibility, magnetotransport measurements, and Andreev reflection spectroscopy. Temperature dependencies of the superconducting gap and of the specific heat were found to be well consistent with those expected for the single band BCS superconductors with an isotropic s-wave order parameter. Despite spin-orbit coupling present in SnAs, our data show no signatures of a potential unconventional superconductivity, and the characteristic BCS ratio 2Δ/Tc=3.48–3.73 is very close to the BCS value in the weak coupling limit.

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Держатели документа:
PN Lebedev Phys Inst, VL Ginzburg Ctr High Tc Superconduct & Quantum Ma, Moscow 119991, Russia.
Natl Res Univ Higher Sch Econ, Fac Phys, Moscow 101000, Russia.
Russian Acad Sci, Inst Electrophys, Ural Branch, Ekaterinburg 620016, Russia.
RAS, SB, KSC, Kirensky Inst Phys,Fed Res Ctr, Krasnoyarsk 660036, Russia.
St Petersburg State Univ, Fac Phys, St Petersburg 198504, Russia.
St Petersburg State Univ, Res Pk, St Petersburg 198504, Russia.
St Petersburg State Univ, Lab Elect & Spin Struct Nanosyst, St Petersburg 198504, Russia.
Natl Res Univ Higher Sch Econ, Quantum Nanoelect Lab, Moscow 101000, Russia.

Доп.точки доступа:
Bezotosnyi, P. I.; Dmitrieva, K. A.; Sadakov, A. V.; Pervakov, K. S.; Muratov, A. V.; Usoltsev, A. S.; Tsvetkov, A. Yu.; Gavrilkin, S. Yu.; Pavlov, N. S.; Slobodchikov, A. A.; Слободчиков, А. А.; Vilkov, O. Yu.; Rybkin, A. G.; Nekrasov, I. A.; Pudalov, V. M.; Russian Foundation for Basic Research (RFBR)Russian Foundation for Basic Research (RFBR) [16-29-03330, 17-02-00015, 19-32-50001]; Ministry of Science and Higher Education of the Russian Federation [0023-2019-0005]; Saint Petersburg State University [40990069]; Presidium of RASRussian Academy of Sciences [12]; [MK-1683.2019.2]
}
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Observation of soft phonon mode in TbFe3(BO3)4 by inelastic neutron scattering / M. S. Pavlovskiy [et al.] // Phys. Rev. B. - 2018. - Vol. 97, Is. 5. - Ст. 054313, DOI 10.1103/PhysRevB.97.054313. - Cited References:40. - This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by Oak Ridge National Laboratory. L.S.W. was supported by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US DOE. The work was funded by RFBR, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund according to Research Project No. 16-42-243039. . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Physics, Condensed Matter
Рубрики:
STRUCTURAL PHASE-TRANSITIONS
SINGLE-CRYSTAL
SPECTROSCOPY
Аннотация: The phonon dispersion in terbium iron borate TbFe3(BO3)4 has been measured by inelastic neutron scattering in a temperature range 180˂T˂350 K through the displacive structural transition at TS=192.5K and studied by ab initio calculations. Significant, but not complete, softening of the transverse acoustic (TA) branch has been observed at the corner of the Brillouin zone (Λ point) at temperatures T⪆TS, in full agreement with theoretical calculations. The TA soft mode undergoes considerable broadening at the Λ point near the transition temperature that can be attributed to the anharmonic interference between transverse acoustic and optical modes.

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Держатели документа:
Kirensky Inst Phys, Fed Res Ctr, Krasnoyarsk 660036, Russia.
Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN 37831 USA.
Oak Ridge Natl Lab, Neutron Technol Div, Oak Ridge, TN 37831 USA.

Доп.точки доступа:
Pavlovskiy, M. S.; Павловский, Максим Сергеевич; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Wu, L. S.; Ehlers, G.; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна; Shinkorenko, A. S.; Шинкоренко, Алексей Сергеевич; Podlesnyak, A.; Laboratory Directed Research and Development Program of Oak Ridge National Laboratory; RFBR, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [16-42-243039]
}
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Crystal structure, phase transition and structural deformations in iron borate (Y0.95Bi0.05)Fe3(BO3)4 in the temperature range 90–500 K / E. S. Smirnova [et al.] // Acta Crystallogr. B. - 2018. - Vol. 74. - P. 226-238, DOI 10.1107/S2052520618002962. - Cited References:27. - The following funding is acknowledged: Russian Foundation for Basic Research (award No. 17-02-00766) and Federal Agency of Scientific Organizations (Agreement No 007-GZ/Ch3363/26). . - ISSN 2052-5206

РУБ Chemistry, Multidisciplinary + Crystallography
Рубрики:
HIGH-PRESSURES
   GDFE3(BO3)4
   SPECTROSCOPY
   IFEFFIT
Кл.слова (ненормированные):
rare-earth iron borates -- crystal structure -- structural phase transition -- structural deformations
Аннотация: An accurate X-ray diffraction study of (Y0.95Bi0.05)Fe3(BO3)4 single crystals in the temperature range 90–500 K was performed on a laboratory diffractometer and used synchrotron radiation. It was established that the crystal undergoes a diffuse structural phase transition in the temperature range 350–380 K. The complexity of localization of such a transition over temperature was overcome by means of special analysis of systematic extinction reflections by symmetry. The transition temperature can be considered to be Tstr ≃ 370 K. The crystal has a trigonal structure in the space group P3121 at temperatures of 90–370 K, and it has a trigonal structure in the space group R32 at 375–500 K. There is one type of chain formed by the FeO6 octahedra along the c axis in the R32 phase. When going into the P3121 phase, two types of nonequivalent chains arise, in which Fe atoms are separated from the Y atoms by a different distance. Upon lowering the temperature from 500 to 90 K, a distortion of the Y(Bi)O6, FeO6, B(2,3)O3 coordination polyhedra is observed. The distances between atoms in helical Fe chains and Fe—O—Fe angles change non-uniformly. A sharp jump in the equivalent isotropic displacement parameters of O1 and O2 atoms within the Fe—Fe chains and fluctuations of the equivalent isotropic displacement parameters of B2 and B3 atoms were observed in the region of structural transition as well as noticeable elongation of O1, O2, B2, B3, Fe1, Fe2 atomic displacement ellipsoids. It was established that the helices of electron density formed by Fe, O1 and O2 atoms may be structural elements determining chirality, optical activity and multiferroicity of rare-earth iron borates. Compression and stretching of these helices account for the symmetry change and for the manifestation of a number of properties, whose geometry is controlled by an indirect exchange interaction between iron cations that compete with the thermal motion of atoms in the structure. Structural analysis detected these changes as variations of a number of structural characteristics in the c unit-cell direction, that is, the direction of the helices. Structural results for the local surrounding of the atoms in (Y0.95Bi0.05)Fe3(BO3)4 were confirmed by EXAFS and Mössbauer spectroscopies.

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Держатели документа:
Russian Acad Sci, Fed Sci Res Ctr Crystallog & Photon, Shubnikov Inst Crystallog, Moscow 119333, Russia.
Natl Res Ctr, Kurchatov Inst, Moscow 123182, Russia.
Russian Acad Sci, Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Smirnova, Ekaterina S.; Alekseeva, Olga A.; Dudka, Alexander P.; Artemov, V. V.; Zubavichus, Yan V.; Gudim, I. A.; Гудим, Ирина Анатольевна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Frolov, Kirill V.; Lyubutin, Igor S.; Russian Foundation for Basic Research [17-02-00766]; Federal Agency of Scientific Organizations [007-GZ/Ch3363/26]
}
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    Preparation and characterization of colloidal copper xanthate nanoparticles / Y. Mikhlin [et al.] // New J. Chem. - 2016. - Vol. 40, Is. 4. - P. 3059-3065, DOI 10.1039/c6nj00098c. - Cited References:50. - This research was supported by the Russian Science Foundation grant 14-17-00280. We thank Dr Roberto Felix Duarte (HZB) and bilateral program "German-Russian laboratory at BESSY II" for assistance with the X-ray absorption experiments. . - ISSN 1144-0546. - ISSN 1369-9261
   Перевод заглавия: Получение и исследование коллоидных наночастиц ксантогената меди

РУБ Chemistry, Multidisciplinary
Рубрики:
X-ray-absorption
   Self-assembled monolayers
   Sulfide nanoparticles
   Electronic-structure
   Waste-water
   Complexes
   Flotation
   Spectroscopy
   Adsorption
   Oxidation
Аннотация: Despite the important role of metal xanthates in a number of industrial processes and emerging applications, no attempts have been made to prepare the metal xanthate nanoparticles and to study colloidal solutions of insoluble heavy metal xanthates. Here, we examined the formation of colloidal copper xanthate particles during the reactions of aqueous solutions of cupric sulfate and various potassium xanthates, which occur in flotation and water treatment slurries and can be used to manufacture nanoparticles for materials science (e.g., as precursors for copper sulfide nanoparticles and biomedicine). The products were characterized using UV-vis absorption, dynamic light scattering, zeta potential measurements, transmission electron microscopy (TEM), electron diffraction, Fourier transform infrared spectroscopy, thermogravimetry, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy (XANES). Colloidal copper xanthates with compositions of ROCSSCu (R = ethyl, isopropyl, butyl, isobutyl, and amyl groups), disordered structures and average diameters of 20–80 nm easily formed and aggregated and were stable for at least several hours, especially if excessive xanthate was used. The hydrodynamic diameters of the nanoparticles were smaller at lower temperatures. Dixanthogens, which were produced in the reactions along with ROCSSCu, seemed to promote nanoparticle aggregation and precipitated with the copper xanthate, affecting their thermal decomposition. The TEM micrographs and S K- and Cu K-edge XANES spectra revealed core/shell particle morphologies, likely with Cu(I) bonded to four S atoms in the core and reduced copper coordination in the shell.

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Держатели документа:
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Akad 50-24, Krasnoyarsk 6600036, Russia.
Siberian Fed Univ, Svobodny Pr 79, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Akad 50-38, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Mikhlin, Y. L.; Михлин, Юрий Леонидович; Vorobyev, S.; Saikova, S. V.; Сайкова, С. В.; Tomashevich, Y.; Fetisova, O.; Kozlova, S.; Zharkov, S. M.; Жарков, Сергей Михайлович; Russian Science Foundation [14-17-00280]
}
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NMR applications for polymer composite materials moisture uptake investigation / V. M. Bouznik [et al.] // Appl. Magn. Reson. - 2016. - Vol. 47, Is. 3. - P. 321-334, DOI 10.1007/s00723-015-0748-2. - Cited References: 41. - This research was performed with the financial support of Russian Foundation for Basic Research (project no. 14-29-10178 ofi_m). . - ISSN 0937-9347

РУБ Physics, Atomic, Molecular & Chemical + Spectroscopy
Рубрики:
FIELD GRADIENT NMR
   REINFORCED EPOXY COMPOSITES
   WATER SELF-DIFFUSION
   TRANSPORT
   GLASS
   SYSTEM
   SPECTROSCOPY
   TEMPERATURE
   ABSORPTION
   ADHESIVE
Аннотация: The 1H nuclear magnetic resonance (NMR) spectroscopy, NMR imaging, and pulsed field gradient NMR (PFG NMR) were applied for comparative study of moisture–polymer composite materials (PCM) interaction. The water uptake in PCM reinforced by aramid and carbon fibers was measured by NMR spectroscopy techniques. The aramid fiber-reinforced PCM absorbs water more intensively compared with PCM reinforced by carbon fiber, but both of them are retaining water inside of pores without formation of chemical bonds. Using NMR imaging the spatial distribution of water absorbed was visualized; preferable water pathways and influence of surface treatment on water-resistant properties were revealed. It was found that the surface rough treatment sufficiently improves the water absorption, but penetration of water molecules is still occurring only through the surfaces and it happens within a thin layer. PFG NMR technique revealed influence of pore structure on moisture–PCM interaction; it was found that additionally to strong hydrophobic properties of carbon fiber, the smaller total volume of pores sufficiently decrease the water uptake. Results achieved in this work demonstrate efficiency of NMR methods applied all together for investigation of PCM, and information obtained is practically important when designing advanced PCM with required properties. © 2016, Springer-Verlag Wien.

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Держатели документа:
Institute of Problems of Chemical Physics RAS, Chernogolovka, Russian Federation
All-Russian Scientific Research Institute of Aviation Materials, Moscow, Russian Federation
Kirensky Institute of Physics SB RAS, Krasnoyarsk, Russian Federation
Institute of Chemistry and Chemical Technology SB RAS, Krasnoyarsk, Russian Federation
Science Center in Chernogolovka of the Russian Academy of Sciences, Chernogolovka, Russian Federation

Доп.точки доступа:
Bouznik, V. M.; Morozov, E. V.; Морозов, Евгений Владимирович; Avilova, I. A.; Volkov, V. I.
}
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Gorelik, V. S.
Raman scattering in sodium nitrite crystals near the phase transition / V. S. Gorelik, A. Y. Pyatyshev, A. S. Krylov // Phys. Solid State. - 2016. - Vol. 58, Is. 1. - P. 170-176, DOI 10.1134/S1063783416010133. - Cited References: 39. - This study was supported by the Russian Foundation for Basic Research (project nos. 12-02-00491, 13-02-00449, 13-02-90420, and 14-02-00190). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
NaNO2
   SPECTROSCOPY
   DEPENDENCE
   SPECTRUM
   SEARCH
   MODES
Аннотация: Optical Raman spectra of a ferroelectric sodium nitrite crystal have been detected in a wide spectrum range at various temperatures, including the region of the ferroelectric phase transition. A manifestation of a transverse soft polar mode of the A1(z) type responsible for the ferroelectric phase transition has been discovered in the spectrum at room temperature. This mode has been found to become overdamped even far from the ferroelectric phase transition temperature. This mode also appears as a central peak under heating. It has been found that the pseudoscalar mode of the A2 type has the highest intensity in the Raman spectrum of sodium nitrite. The frequency corresponding to the maximum intensity of this mode in the Raman spectrum varies from 130 cm–1 at 123 K to 106 cm–1 at T = 513 K. A fair agreement of the experimental data for the A1(z) mode with the Lyddane–Sachs–Teller relation has been established. The polariton curves for the A1(z) polar mode and the dispersion curves for axinons has been plotted. © 2016, Pleiades Publishing, Ltd.

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Публикация на русском языке Горелик, Владимир Семенович. Комбинационное рассеяние света в области фазового перехода в кристаллах нитрита натрия [Текст] / В. С. Горелик, А. Ю. Пятышев, А. С. Крылов // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2016. - Т. 58 Вып. 1. - С. 163-169

Держатели документа:
Lebedev Physical Institute, Russian Academy of Sciences, Leninskii pr. 53, Moscow, Russian Federation
Bauman Moscow State Technical University, Vtoraya Baumanskaya ul. 5, Moscow, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Pyatyshev, A. Y.; Krylov, A. S.; Крылов, Александр Сергеевич
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10.

    Gorelik, V. S.
    Raman light scattering in sodium nitrite crystals / V. S. Gorelik, A. Y. Pyatyshev, A. S. Krylov // Bull. Lebedev Phys. Inst. - 2016. - Vol. 43, Is. 5. - P. 167-173, DOI 10.3103/S1068335616050043. - Cited References:37. - This study was supported by the Russian Foundation for Basic Research, projects nos. 12-02-00491, 13-02-00449,13-02-90420, 14-02-00190. . - ISSN 1068-3356. - ISSN 1934-838X
Рубрики:
NANO2
   PHASE
   SPECTROSCOPY
   PARAPHOTONS
   DEPENDENCE
   SPECTRUM
   SEARCH
Кл.слова (ненормированные):
sodium nitrite -- Raman scattering -- spectrum -- polar mode -- polariton -- ferroelectric -- dispersion curves
Аннотация: Raman light scattering spectra of a ferroelectric sodium nitrite crystal is studied in the lattice mode region as the temperature is lowered from room temperature to 123 K. The existence of a Raman satellite corresponding to the soft lattice mode, i.e., transverse polar vibration responsible for the ferroelectric phase transition, is established for the first time. It is found that the intensity of the Raman scattering by the pseudo-scalar low-frequency A (2) mode exceeds the intensity of other lattice variations by an order of magnitude.

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Публикация на русском языке Горелик, Владимир Семенович. Комбинационное рассеяние света в кристаллах нитрита натрия [Текст] / В. С. Горелик, А. Ю. Пятышев, А. С. Крылов // Кратк. сообщ. по физ. : Физический институт им. П. Н. Лебедева РАН, 2016. - Т. 43 № 5. - С. 26-36

Держатели документа:
Russian Acad Sci, PN Lebedev Phys Inst, Leninskii Pr 53, Moscow 119991, Russia.

Доп.точки доступа:
Pyatyshev, A. Yu.; Krylov, A. S.; Крылов, Александр Сергеевич; Russian Foundation for Basic Research [12-02-00491, 13-02-00449, 13-02-90420, 14-02-00190]
}
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11.

Rhodium(III) speciation in concentrated nitric acid solutions / D. Vasilchenko [et al.] // Eur. J. Inorg. Chem. - 2016. - Vol. 2016, Is. 23. - P. 3822-3828, DOI 10.1002/ejic.201600523. - Cited References:31. - This work was supported by the Russian Foundation for Basic Research (grant number 16-03-00549 A). D. V. thanks the Ministry for Education and Science of the Russian Federation for the award of a President of the Russian Federation for Young Scientists Fellowship. . - ISSN 1434-1948. - ISSN 1099-0682

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
MAGNETIC-RESONANCE
   FISSION PLATINOIDS
   AQUEOUS-SOLUTIONS
   PT-195 NMR
   RH(III)
   SPECTROSCOPY
   CHEMISTRY
   DISSOCIATION
   PLATINUM(IV)
   COMPLEXES
Кл.слова (ненормированные):
Rhodium -- NMR spectroscopy -- Nitrates
Аннотация: The interaction of rhodium(III) aqua ions with nitrate ions in 3–16 m nitric acid solutions has been studied by 103Rh and 15N NMR and Raman spectroscopy. The mononuclear complexes [Rh(H2O)6–n(NO3)n]3–n (n = 1–4) were found to be the only form of rhodium(III) existing in the solutions with the metal concentration in the range 0.2–1.3 m. The dynamics of the H2O → NO3– substitution process was studied at 80 °C. An increase in the average number of nitrate groups bonded to rhodium with increasing concentration of nitric acid was also determined. The fine crystalline salt Rb4trans-[Rh(H2O)2(NO3)4][Rh(NO3)6] was obtained by solvothermal concentration of the rhodium nitric acid solution on addition of rubidium nitrate. The structure of the salt was solved by the powder X-ray diffraction method, with monodentate coordination of nitrato ligands found for both the [Rh(NO3)6]3– and trans-[Rh(H2O)2(NO3)4]– anions.

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Держатели документа:
Russian Acad Sci, Nikolaev Inst Inorgan Chem, Siberian Branch, Novosibirsk 630090, Russia.
Novosibirsk State Univ, Novosibirsk 630090, Russia.
RAS, Inst Chem & Chem Technol, SB, Krasnoyarsk 660049, Russia.
RAS, Kirensky Inst Phys, SB, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, 79 Svobodny Pr, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Vasilchenko, D.; Vorob'eva, S.; Tkachev, S.; Baidina, I. A.; Belyaev, A.; Korenev, S.; Solovyov, L.; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Russian Foundation for Basic Research [16-03-00549 A]; Ministry for Education and Science of the Russian Federation
}
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12.

    Raman spectra and phase composition of MnGeO3 crystals / A. S. Oreshonkov [et al.] // J. Raman Spectrosc. - 2016. - Vol. 47, Is. 5. - P. 531-536, DOI 10.1002/jrs.4816. - Cited References:21. - The work was partially supported by the RFBR through grants no. 13-02-00825.; O.A.S. and K.A.S. are partially supported by the Ministry of Science and Education of the Russian Federation. . - ISSN 0377-0486. - ISSN 1097-4555
   Перевод заглавия: Раман спектры и фазовый состав кристаллов MnGeO3

РУБ Spectroscopy
Рубрики:
TENSOR ANALYSIS
   SINGLE-CRYSTAL
   POLYCRYSTALLINE
   SPECTROSCOPY
   PYROXENE
Кл.слова (ненормированные):
Raman spectroscopy -- lattice dynamics -- Raman tensor analysis -- orthopyroxene -- clinopyroxene
Аннотация: MnGeO3 single-crystal samples have been synthesized by optical zonal melting and spontaneous crystallization. X-ray crystal analysis showed the first sample to be a two-phase one with phase ratio as follows: 17% - monoclinic C2/c, and 83% - orthorhombic Pbca; the phase ratio of the second sample was unknown. Raman spectra have been produced for these samples. Lattice dynamics has been simulated and polarization dependencies of lines' intensities have been analyzed to interpret experimental Raman spectra and to attribute lines to the spectra of monoclinic and orthorhombic phases. Copyright (C) 2015 John Wiley & Sons, Ltd.

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Держатели документа:
RAS, Kirensky Inst Phys, SB, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.

Доп.точки доступа:
Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Gerasimova, J. V.; Герасимова, Юлия Валентиновна; Ershov, A. A.; Ершов, Александр Андреевич; Krylov, A. S.; Крылов, Александр Сергеевич; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Vtyurin, A. N.; Втюрин, Александр Николаевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Terent'ev, K. Yu.; Терентьев, Константин Юрьевич; Mikhashenok, N. V.; Михашенок, Наталья Владимировна; RFBR [13-02-00825]; Ministry of Science and Education of the Russian Federation
}
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13.

Magnetic properties, morphology and interfaces of (Fe/Si)n nanostructures / Bartolome J. [et al.] // J. Magn. Magn. Mater. - 2016. - Vol. 400. - P. 271-275, DOI 10.1016/j.jmmm.2015.07.046. - Cited References: 43. - The financial support of the Spanish MINECOMAT2011-23791 and MAT2015-53921-R, Aragonese DGA-IMANAE34 (cofounded by Fondo Social Europeo) and European FEDER funds is acknowledged. Program of the President of the Russian Federation for the support of leading scientific schools (Scientific School 2886.2014.2), RFBR (Grant no. 13-02-01265), the Ministry of Education and Science of the Russian Federation (State contract no. 02.G25.31.0043 and State task no. 16.663.2014К) . - ISSN 0304-8853

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
INTERLAYER EXCHANGE
   Fe/Si(100) INTERFACE
   SILICIDE FORMATION
   ULTRAHIGH-VACUUM
   FILMS
   IRON
   MAGNETORESISTANCE
   SUPERLATTICES
   SPECTROSCOPY
   DEPOSITION
Аннотация: A systematic study of the iron–silicon interfaces formed upon preparation of (Fe/Si) multilayers has been performed by the combination of modern and powerful techniques. Samples were prepared by molecular beam epitaxy under ultrahigh vacuum onto Si wafers or single crystalline Ag(100) buffer layers grown on GaAs(100). The morphology of these films and their interfaces was studied by a combination of scanning transmission electron microscopy, X-ray reflectivity, angle resolved X-ray photoelectron spectroscopy and hard X-ray photoelectron spectroscopy. The Si-on-Fe interface thickness and roughness were determined to be 1.4(1) nm and 0.6(1) nm, respectively. Moreover, determination of the stable phases formed at both Fe-on-Si and Si-on-Fe interfaces was performed using conversion electron Mössbauer spectroscopy on multilayers with well separated Si-on-Fe and Fe-on-Si interfaces. It is shown that while a fraction of Fe remains as α-Fe, the rest has reacted with Si, forming the paramagnetic FeSi phase and a ferromagnetic Fe rich silicide. We conclude that there is an identical paramagnetic c-Fe1−xSi silicide sublayer in both Si-on-Fe and Fe-on-Si interfaces, whereas an asymmetry is revealed in the composition of the ferromagnetic silicide sublayer.

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Доп.точки доступа:
Bartolome, J.; Badía-Romano, L.; Rubin J.; Bartolome F.; Varnakov, S. N.; Варнаков, Сергей Николаевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Burgler D.E.; International Conference on Magnetism(20 ; 2015 ; Jul ; 5-10 ; Barselona, Spain)
Свободных экз. нет}
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14.

    Raman study of datolite CaBSiO4(OH) at simultaneously high pressure and high temperature / S. V. Goryainov [et al.] // J. Raman Spectrosc. - 2015. - Vol. 46, Is. 1. - P. 177-181, DOI 10.1002/jrs.4614. - Cited References:30. - This work was partly supported by the Russian Foundation for BasicResearch (grants N 14-05-00616 and 13-05-00185) and the Ministry ofEducation and Science of the Russian Federation. . - ISSN 0377. - ISSN 1097-4555
   Перевод заглавия: Исследование датолита CaBSiO4(ОН) при одновременно высоком давлении и высокой температуре методом спектроскопии комбинационного света

РУБ Spectroscopy
Рубрики:
X-RAY-DIFFRACTION
   CRYSTAL-STRUCTURE
   HYDROGEN-BOND
   SPECTROSCOPY
Кл.слова (ненормированные):
Raman spectra -- datolite -- high pressure -- high temperature -- diamond anvil -- cell
Аннотация: Using an in situ method of Raman spectroscopy and resistance-heated diamond anvil cell, the system datolite CaBSiO4(OH) – water has been investigated at simultaneously high pressure and temperature (up to Р ~5 GPa and Т ~250 °С). Two polymorphic transitions have been observed: (1) pressure-induced phase transition or the feature in pressure dependence of Raman band wavenumbers at P = 2 GPа and constant T = 22 °С and (2) heating-induced phase transition at T ~90 °С and P ~5 GPа. The number of Raman bands is retained at the first transition but changed at the second transition. The first transition is mainly distinguished by the changes in the slopes of pressure dependence of Raman peaks at 2 GPa. The second transition is characterized by several strong changes: the wavenumber jumps of major bands, the merging of strong doublets at 378 and 391 cm−1 (values for ambient conditions), the splitting of the intermediate-intensity band at 292 cm−1, and the transformation of some low-wavenumber bands at 160–190 cm−1. No spectral and visual signs of overhydration and amorphization have been observed. No noticeable dissolution of datolite in the water medium occurred at 5 GPa and 250 °С after 3 h, which corresponds to typical conditions of the ‘cold’ zones of slab subduction. Copyright © 2014 John Wiley & Sons, Ltd.

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Держатели документа:
VS Sobolev Inst Geol & Mineral SB RAS, Novosibirsk 630090, Russia.
LV Kirensky Inst Phys SB RAS, Krasnoyarsk 660036, Russia.
Univ Saskatchewan, Dept Geol Sci, Saskatoon, SK S7N 5E2, Canada.

Доп.точки доступа:
Goryainov, S. V.; Krylov, A. S.; Крылов, Александр Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Pan, Y.; Russian Foundation for Basic Research [N 14-05-00616, 13-05-00185]; Ministry of Education and Science of the Russian Federation
}
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15.

Val'kov, V. V.
Quantum transport through a multilevel magnetic structure with multiple inelastic scattering in a magnetic field taken into account / V. V. Val'kov, S. V. Aksenov, E. A. Ulanov // Low Temp. Phys. - 2015. - Vol. 41, Is. 2. - P. 98-105, DOI 10.1063/1.4913204. - Cited References:33. - This work was supported by the Program of the Presidium of RAS "Quantum mesoscopic and disordered systems" and Russian Foundation for Basic Research (Grant Nos. 13-02-00523, 13-02-98013, and 14-02-31280).One of the authors (S.V.A.) is grateful to the grant of the President of the Russian Federation MK-526.2013.2 and the scholarship of the President of the Russian Federation SP-6361.2013.5 for the support. . - ISSN 1063. - ISSN 1090-6517. -

РУБ Physics, Applied
Рубрики:
SINGLE-MOLECULE
   SPECTROSCOPY
   ATOM
   ANISOTROPY
Аннотация: We present a solution for the problem of quantum electron transport through a magnetic atom adsorbed inside a break junction with paramagnetic metal electrodes. In agreement with experimental data, it was assumed that the conduction electrons experience inelastic scattering by the adsorbate due to s–d(f)-exchange interaction. The Keldysh technique was employed to obtain a general expression describing a current through the multilevel structure at finite temperatures in terms of the nonequilibrium Green's function. The use of the atomic representation allowed to exactly account for the non-equidistant structure of the energy spectrum of a magnetic atom and to simplify substantially the application of the Wick theorem for construction of the nonequilibrium diagrammatic technique for the Hubbard operators. The calculation of the current-voltage characteristics of the magnetic adatom in the tunnel regime at low temperatures revealed the presence of regions with a negative differential conductance in a magnetic field.

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Публикация на русском языке Вальков, Валерий Владимирович. Квантовый транспорт через многоуровневую магнитную структуру при учете процессов многократного неупругого рассеяния в магнитном поле [Текст] / В. В. Вальков, С. В. Аксенов, Е. А. Уланов // Физ. низких температур : Физико-технический институт низких температур им. Б. И. Веркина НАН Украины, 2015. - Т. 41 Вып. 2. - С. 129-138

Держатели документа:
Kirenskii Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Aerosp Univ, Krasnoyarsk 660014, Russia.

Доп.точки доступа:
Aksenov, S. V.; Аксенов, Сергей Владимирович; Ulanov, E. A.; Вальков, Валерий Владимирович; Program of the Presidium of RAS "Quantum mesoscopic and disordered systems"; Russian Foundation for Basic Research [13-02-00523, 13-02-98013, 14-02-31280]; Russian Federation [MK-526.2013.2, SP-6361.2013.5]
}
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16.

Spectral signatures of spin-phonon and electron-phonon interactions in multiferroic iron borates / M. N. Popova [et al.] // J. Magn. Magn. Mater. - 2015. - Vol. 383. - P. 250-254, DOI 10.1016/j.jmmm.2014.10.095. - Cited References:32. - This work was supported by the Russian Science Foundation (Grant no. 14-12-01033). Experiments at U4-IR beamline NSLS-BNL (T.N.S. and A.A.S.) were performed under Contract no. DE-FG02-07ER46382 from the U.S. Department of Energy. The National Synchrotron Light Source is operated as a User Facility for the U.S. Department of Energy under Contract no. DE-AC02-98CH10886. M.N.P. thanks B.Z. Malkin for helpful discussions. . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SMFE3(BO3)4
   SPECTROSCOPY
   CRYSTALS
   SM
Кл.слова (ненормированные):
Rare-earth iron borates -- Spin phonon interactions -- Electron phonon coupling -- Optical spectroscopy
Аннотация: High-resolution far-infrared reflection and polarized ellipsometry, as well as Raman scattering temperature-dependent measurements are used to study spin-phonon and electron-phonon interactions in rare-earth (RE) iron borates with the R32 structure of a natural mineral huntite, namely, in RFe3(BO3)4 with R=Pr, Nd, and Sm. Pronounced peculiarities in the ω(T) dependences at the Néel temperature TN≈32 K are observed for all the compounds studied and the origin of these peculiarities is discussed. A coupling between lattice phonons and crystal-field excitations of a RE ion manifests itself by a renormalization of frequencies and intensities of coupled modes. Modeling of the spectra has revealed the value of about 15 cm−1 for the electron–phonon coupling constant in PrFe3(BO3)4.
Высокоразрешающая эллипсометрия дальнего инфракрасного отражения и поляризованный света, а также температурнозависимые измерения комбинационного рассеяния используются для изучения спин-фононных и электрон-фононных взаимодействий в редкоземельных (RE) боратах железа со структурой R32 природного минерала хантита , а именно, в RFe3 (BO3) 4 с R = Pr, Nd, и Sm. Выраженные особенности ω (T) зависимостей при температуре Нееля TN ≈32 K наблюдаются для всех исследованных соединений и происхождение этих особенностей обсуждается.Связь между фононами решетки и возбуждениями кристаллического поля РЗ иона проявляется себя перенормализации частоты и интенсивности связанных мод. Моделирование спектров показал значение около 15cm-1 для константы электрон-фононной связи в PrFe3 (BO3) 4.

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Доп.точки доступа:
Popova, M. N.; Boldyrev, K. N.; Klimin, S. A.; Stanislavchuk, T. N.; Sirenko, A. A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Russian Science Foundation [14-12-01033]; U.S. Department of Energy [DE-FG02-07ER46382, DE-AC02-98CH10886]; Moscow International Symposium on Magnetism(6 ; 2014 ; June-July ; Moscow)
}
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17.

    Antiferromagnetic dichroism in a complex multisublattice magnetoelectric CuB2O4 / K. N. Boldyrev [et al.] // Phys. Rev. Lett. - 2015. - Vol. 114, Is. 24. - Ст. 247210, DOI 10.1103/PhysRevLett.114.247210. - Cited References:40. - This study was supported by the Russian Academy of Sciences under the Programs for Basic Research, by the President of the Russian Federation (Grant No. MK-3521.2015.2, K. N. B.), by the Russian Foundation for Basic Research (Grants No. 15-32-20613, K. N. B., and No. 15-02-04222, R. V. P.), and by the Ministry of Education and Science of the Russian Federation (Grant No. 14.B25.0031.25, R. V. P.). . - ISSN 0031. - ISSN 1079-7114
   Перевод заглавия: Антиферромагнитный дихроизм в сложном многоподрешеточном магнетоэлектрике CuB2O4

РУБ Physics, Multidisciplinary
Рубрики:
MAGNETIC SOLITON LATTICE
   COPPER METABORATE
   GYROTROPIC BIREFRINGENCE
   SPECTROSCOPY
   EXCITATIONS
   TRANSITIONS
   CRYSTALS
   Cr2O3
   FIELD
Аннотация: Magnetic control of the crystal chirality was announced by Saito et al. [Phys. Rev. Lett. 101, (2008)] on the ground of experiments in CuB2O4. This claim has raised a sharp dispute in the literature because it seemed to contradict the fundamental symmetry principles. We settle this dispute on the basis of a high-resolution optical spectroscopy study of excitonic transitions in CuB2O4. We find that a large sublattice-sensitive antiferromagnetic linear dichroism (LD) emerges at the Néel temperature TN=21 K and show how it could simulate a “magnetic-field control of the crystal chirality.” We prove that the discovered LD is related microscopically to the magnetic Davydov splitting. This LD is highly sensitive to subtle changes in the spin subsystems, which allowed us to observe a splitting of the phase transition into an incommensurate magnetic phase into two transitions (T∗1=8.5 and T∗2=7.9 K) and to suggest elliptical spiral structures below T∗1, instead of a simple circular helix proposed earlier.
О магнитном контроле кристаллической хиральности сообщил Сайто и др. [Phys. Rev. Lett. 101, 117402 (2008)] на основании экспериментов в CuB2O4. Это требование вызвало резкий спор в литературе, потому что это казалось, противоречат основным принципам симметрии. Мы урегулировать этот спор на основе исследования с помощью оптической спектроскопии высокого разрешения экситонных переходов в CuB2O4. Мы считаем, что большой подрешетко-чувствительный антиферромагнитный линейный дихроизм (LD) возникает при температуре Нееля TN= 21 Kи показываем, как это может имитировать "контроль магнитным полем кристаллической хиральности." Мы докажем, что обнаруженный LD связанс микроскопическим магнитным Давыдовским расщеплением. Этот Л.Д. весьма чувствителен к тонким изменениям в спиновых подсистем, которые позволили нам наблюдать расщепление фазового перехода в несоизмеримы магнитная фаза в двух переходов (T*1= 8,5 и Т*2 = 7,9 К) и предположить эллиптическую спиральную структуру ниже T*1, вместо простой круговой спирали предложенный ранее.

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Держатели документа:
RAS, Inst Spect, Moscow 142190, Russia.
RAS, Ioffe Phys Tech Inst, St Petersburg 194021, Russia.
RAS, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Boldyrev, K. N.; Pisarev, R. V.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Popova, M. N.; Russian Academy of Sciences under the Programs for Basic Research; Russian Federation [MK-3521.2015.2]; Russian Foundation for Basic Research [15-32-20613, 15-02-04222]; Ministry of Education and Science of the Russian Federation [14.B25.0031.25]
}
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18.

    Crystal and local atomic structure of MgFeBO4,Mg0.5Co0.5FeBO4, and CoFeBO4: effects of Co substitution / N. V. Kazak [et al.] // Phys. Status Solidi B. - 2015. - Vol. 252, Is. 10. - P. 2245-2258, DOI 10.1002/pssb.201552143. - Cited References: 46. - This work has been financed by the MECOM Project MAT11/23791, and DGA IMANA project E-34, Council for Grants of the President of the Russian Federation (project nos. NSh-2886.2014.2, SP-938.2015.5), and Russian Foundation for Basic Research (project nos. 13-02-00958-a, 13-02-00358-a, 14-02-31051-mol-a). The work of one of the coauthors (M.S.P.) was supported by the program of Foundation for promoting the development of small enterprises in scientific and technical sphere ("UMNIK" program). . - ISSN 0370. - ISSN 1521-3951
   Перевод заглавия: Кристаллическая и локальная атомная структура MgFeBO4, Mg0.5Co0.5FeBO4 and CoFeBO4: эффект замещения Со

РУБ Physics, Condensed Matter
Рубрики:
SPIN-GLASS BEHAVIOR
   MAGNETIC WARWICKITES
   SINGLE-CRYSTALS
   PHASE-RELATIONS
   OXYBORATE
   SYSTEM
   SPECTROSCOPY
   ANISOTROPY
   MN2OBO3
   FE2OBO3
Кл.слова (ненормированные):
crystal structure -- XANES -- EXAFS -- magnetic semiconductor -- oxyborate
Аннотация: Single-crystalline MgFeBO4, Mg0.5Co0.5FeBO4, and CoFeBO4 have been grown by the ﬂux method. The samples have been characterized by X-ray spectral analysis, X-ray diffraction, and X-ray absorption spectroscopy. The X-ray absorption near-edge structure (XANES) and extended X-ray absorption ﬁne structure (EXAFS) spectra have been measured at the Fe and Co K-edges over a wide temperature range (6.5– 300 K). The composition, the charge state, and local environ- ment of both Fe and Co atoms have been determined. The effects of Co substitution for Mg on the local structural distortions have been revealed experimentally and the M–O bond anisotropy has been found.
Монокристаллические образцы CoFeBO4 были выращены раствор-расплавным методом. Образцы были охарактеризованы с помощью рентгеноспектрального анализа, рентгеновской дифракции и спектроскопии поглощения рентгеновских лучей. Спектры вблизи K-края поглощения рентгеновского излучения структуры (XANES) и далее рентгеновского поглощения тонкой структуры (EXAFS) были измерены для Fe и Co в широком диапазоне температур (6.5- 300К). Состав, состояние заряда, и локальная положение и Fe и Co атомов были определены. Эффекты замещения Co магнием Mg на местные структурные искажения были выявлены экспериментально и анизотропия связи М-О была найдена.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
National Research Center Kurchatov Institute, Moscow, Russian Federation
Servicio de Medidas Fi, sicas, Universidad de Zaragoza, Zaragoza, Spain
Departamento de Fisica de la Materia Condensada, Instituto de Ciencia de Materiales de Aragon, CSIC, Universidad de Zaragoza, Zaragoza, Spain
O. O. Galkin Institute for Physics and Engineering, National Academy of Sciences of Ukraine, Donetsk, Ukraine

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Platunov, M. S.; Платунов, Михаил Сергеевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Ivanova, N. B.; Иванова, Наталья Борисовна; Zubavichus, Y. V.; Veligzhanin, A. A.; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Arauzo, A.; Bartolome, J.; Lamonova, K. V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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19.

Experimental and theoretical methods to study structural phase transition mechanisms in K3WO3F3 oxyfluoride / A. S. Krylov [et al.] // J. Solid State Chem. - 2014. - Vol. 218. - P. 32-37, DOI 10.1016/j.jssc.2014.05.028. - Cited References: 21. - The Authors are grateful to Prof. Zinenko V.I. for constructive discussion of the results. The work has been done with financial support of the Russian Foundation for Basic Research projects nos. 4828.2012.2, 12-02-31205; Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" project no. 8379. . - ISSN 0022-4596. - ISSN 1095-726X

РУБ Chemistry, Inorganic & Nuclear + Chemistry, Physical
Рубрики:
LATTICE-DYNAMICS
   RAMAN-SCATTERING
   ELPASOLITE
   (NH4)3WO3F3
   SPECTROSCOPY
   CRYSTALS
Кл.слова (ненормированные):
Raman spectroscopy -- IR spectroscopy -- NMR spectroscopy -- High hydrostatic pressure -- Oxyfluorides -- Lattice dynamics calculations
Аннотация: The results of structural phase transitions mechanisms study in K3WO3F3oxyfluoride are represented by different experimental and theoretical methods. The structural phase transition anomalies at T1=452 K and T2=414 K of Raman and IR spectra have been analyzed. Using vibrational spectroscopy methods, the NMR-experiment has been done to clarify the nature of found phase transitions: displacive types or order-disorder types. The model of “disordered” crystal was proposed, and the results of lattice dynamics calculation in frameworks of the generalized Gordon–Kim method of ordered (R3) and “disordered” crystals were compared. The high pressure phases were studied by the Raman technique too.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Russian Acad Sci, Siberian Branch, VS Sobolev Inst Geol & Mineral, Novosibirsk 630090, Russia

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Sofronova, S. N.; Софронова, Светлана Николаевна; Kolesnikova, E. M.; Колесникова, Евгения Михайловна; Ivanov, Y. N.; Иванов, Юрий Николаевич; Sukhovsky, A. A.; Суховский, Андрей Андреевич; Goryainov, S. V.; Ivanenko, A. A.; Иваненко, Александр Анатольевич; Shestakov, N. P.; Шестаков, Николай Петрович; Kocharova, A. G.; Кочарова, Алла Георгиевна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Russian Foundation for Basic Research [4828.2012.2, 12-02-31205]; Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" [8379]
}
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20.

Val'kov, V. V.
Inelastic tunnel transport of electrons through an anisotropic magnetic structure in an external magnetic field / V. V. Val'kov, S. V. Aksenov, E. A. Ulanov // J. Exp. Theor. Phys. - 2014. - Vol. 119, Is. 1. - P. 124-137, DOI 10.1134/S1063776114060065. - Cited References: 35. - This work was performed under the Program "Quantum Mesoscopic and Disordered Systems" of the Presidium of the Russian Academy of Sciences and supported financially by the Russian Foundation for Basic Research (project nos. 13-02-00523, 13-02-98013, and 14-02-31280). The work of one of coauthors (S. V. A.) was supported by grant no. MK-526-526.2013.2 of the President of the Russian Federation and scholarship SP-6361.2013.5 of the President of the Russian Federation. . - ISSN 1063-7761. - ISSN 1090-6509

РУБ Physics, Multidisciplinary
Рубрики:
SINGLE-MOLECULE
   SPECTROSCOPY
   ATOM
   STATE
Аннотация: Quantum transport of electrons through a magnetic impurity located in an external magnetic field and affected by a substrate is considered using the Keldysh diagram technique for the Fermi and Hubbard operators. It is shown that in a strongly nonequilibrium state induced by multiple reflections of electrons from the impurity, the current-voltage (I-V) characteristic of the system contains segments with a negative conductivity. This effect can be controlled by varying the anisotropy parameter of the impurity center as well as the parameters of coupling between the magnetic impurity and metal contacts. The application of the magnetic field is accompanied by an increase in the number of Coulomb steps in the I-V curve of the impurity. The effect of appreciable magnetoresistance appears in this case. We demonstrate the possibility of switching between magnetic impurity states with different total spin projection values in the regime of asymmetric coupling of this impurity with the contacts.

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Переводная версия Вальков, Валерий Владимирович. Неупругий туннельный транспорт электронов через анизотропную магнитную структуру во внешнем магнитном поле [Текст] / В. В. Вальков, С. В. Аксенов, Е. А. Уланов // Журн. эксперим. и теор. физ. : Наука, 2014. - Т. 146 Вып. 1. - С. 144-159

Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Aerosp Univ, Krasnoyarsk 660014, Russia

Доп.точки доступа:
Aksenov, S. V.; Аксенов, Сергей Владимирович; Ulanov, E. A.; Уланов Е. А.; Вальков, Валерий Владимирович; Russian Foundation for Basic Research [13-02-00523, 13-02-98013, 14-02-31280]; Russian Federation [MK-526-526.2013.2, SP-6361.2013.5]
}
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