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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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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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Val'kov, V. V.
Effects of multiple reflection in the process of inelastic electron transport through an anisotropic magnetic atom / V. V. Val'kov, S. V. Aksenov, E. A. Ulanov // JETP Letters. - 2013. - Vol. 98, Is. 7. - P. 403-409, DOI 10.1134/S0021364013200162. - Cited References: 27. - This work was supported by the Presidium of the Russian Academy of Sciences (program "Quantum Mesoscopic and Disordered Systems"), the Ministry of Education and Science of Russian Federation (state contract no. 16.740.11.0644, federal program "Human Capital for Science and Education in Innovative Russia" for 2009-2013), and the Russian Foundation for Basic Research (project nos. 12-02-31130, 13-02-00523, and 13-02-98013). S. V. A. is grateful to the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools, project nos. MK-526.2013.2 and SP-6361.2013.5. . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
QUANTUM
SPECTROSCOPY
STATE
Аннотация: The effect of multiple reflection in the process of electron transport on the current-voltage characteristics of an adsorbed magnetic atom with single-ion anisotropy has been investigated. All orders of the perturbation theory with respect to the parameter of coupling between the contacts and the multilevel impurity have been taken into account by the Keldysh diagram technique with the use of Hubbard operators. It has been shown that the current-voltage characteristics of the system in a strongly nonequilibrium regime contains regions of negative differential conductance. The ways of enhancing this effect are discussed.

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Публикация на русском языке Эффекты многократного отражения при неупругом электронном транспорте через анизотропный магнитный атом. - [S. l. : s. n.]

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

Доп.точки доступа:
Aksenov, S. V.; Аксенов, Сергей Владимирович; Ulanov, E. A.; Вальков, Валерий Владимирович; Presidium of the Russian Academy of Sciences; Ministry of Education and Science of Russian Federation [16.740.11.0644]; Russian Foundation for Basic Research [12-02-31130, 13-02-00523, 13-02-98013]; Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools [MK-526.2013.2, SP-6361.2013.5]
}
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Unusual magnetic transitions and nature of magnetic resonance spectra in oxide glasses containing gadolinium / J. . Kliava [et al.] // Phys. Rev. B. - 2005. - Vol. 71, Is. 10. - Ст. 104406, DOI 10.1103/PhysRevB.71.104406. - Cited References: 40 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
ELECTRON-PARAMAGNETIC-RESONANCE
   BORATE GLASSES
   IONS
   BEHAVIOR
   GD3+
   SPECTROSCOPY
   SYSTEMS
   GD-3+
   FIELD
   SHAPE
Кл.слова (ненормированные):
gadolinium -- glass -- lanthanide -- oxide -- anisotropy -- article -- chemical structure -- concentration response -- electron spin resonance -- energy -- magnetism -- molecular physics -- nanoparticle -- phase transition -- refraction index -- temperature sensitivity
Аннотация: Magnetic susceptibility, electron paramagnetic resonance (EPR), and optical properties have been studied in a glass system {20La(2)O(3)-22Al(2)O(3)-23B(2)O(3)-35(SiO2+GeO2)} with a part of La2O3 substituted by Gd2O3 in different concentrations. Positive Weiss constants have been found in the more heavily doped glasses and ascribed to clustering of Gd3+ ions. Two magnetic phase transitions at 55 and 12 K were detected and ascribed, respectively, to ferromagnetic and antiferromagnetic clusters containing Gd ions. The overall shape of the EPR spectra shows the presence of clustering at the higher Gd contents. At low temperatures the cluster-related resonance signal is altered in shape, indicating an onset of magnetic anisotropy field. This signal is convincingly fitted to superparamagnetic resonance arising from ferromagnetic nanoparticles. The clustering, depending on the Gd concentration, correlates with a significant shift to lower energies of the strong optical absorption band edge, ascribed to a charge transfer transition between Gd ions. A nonmonotonous change of refractive index with the increase of the Gd content indicates changes in the glass matrix and in Gd cluster structure.

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Держатели документа:
Univ Bordeaux 1, CNRS, UMR 5798, CPMOH, F-33405 Talence, France
Bar Ilan Univ, Dept Chem, IL-52900 Ramat Gan, Israel
RAS, SB, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
SI Vavilov State Opt Inst, St Petersburg 199034, Russia
Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel
ИФ СО РАН
CPMOH, UMR 5798, CNRS-Universite Bordeaux-I, 33405 Talence Cedex, France
Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel
L. V. Kirensky Institute of Physics SB RAS, Krasnoyarsk 660036, Russian Federation
S. V. Vavilov State Optical Institute, St. Petersburg 199034, Russian Federation
Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel

Доп.точки доступа:
Kliava, J.; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Edelman, I. S.; Эдельман, Ирина Самсоновна; Potseluyko, A. M.; Petrakovskaja, E. A.; Петраковская, Элеонора Анатольевна; Melnikova, S.V.; Мельникова, Светлана Владимировна; Zarubina, T. V.; Petrovskii, G.; Bruckental, Y.; Yeshurun, Y.
}
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    Synthesis and electronic properties of β-RbNd(MoO4)2 / V. V. Atuchin [et al.] // Asian J. Chem. - 2014. - Vol. 26, No. 5. - P. 1284-1286, DOI 10.14233/ajchem.2014.17209. - Cited References: 26. - This study is partly supported by by the Ministry of Education and Science of the Russian Federation. . - ISSN 0970-7077
   Перевод заглавия: Синтез и электронные свойства бета-RbNd(MoO4)2

РУБ Chemistry, Multidisciplinary
Рубрики:
UP-CONVERSION PHOTOLUMINESCENCE
   VIBRATIONAL PROPERTIES
   CRYSTAL-STRUCTURE
   PARTICLES
   MOLYBDATE
   SPECTROSCOPY
   SYSTEM
   ER3+
Кл.слова (ненормированные):
β-RbNd(MoO4)2 -- Electronic structure -- Ab initio calculations -- X-Ray photoelectron spectroscopy
Аннотация: The electronic structure of β-RbNd(MoO4)2 has been evaluated from experimental and theoretical points of view. For the molybdate, X-ray photoelectron valence-band spectra have been measured. The total and partial densities of states of the constituent atoms of β-RbNd(MoO4)2 have been calculated using the FP-LAPW method. The FP-LAPW data reveal that main contributors in the valence-band region of β-RbNd(MoO4)2 are the Rb 4p-, Nd 4f-, Mo 4d- and O 2p-like states.

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Держатели документа:
SB RAS, Lab Opt Mat & Struct, Inst Semicond Phys, Novosibirsk 630090, Russia
Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia
Novosibirsk State Univ, Novosibirsk 630090, Russia
Natl Acad Sci Ukraine, Frantsevich Inst Problems Mat Sci, UA-03142 Kiev, Ukraine
SB RAS, Lab Oxide Syst, Baikal Inst Nat Management, Ulan Ude 670047, Russia
SB RAS, Lab Crystal Phys, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Hanseo Univ, Dept Adv Mat Sci & Engn, Seosan 356706, South Korea

Доп.точки доступа:
Atuchin, V. V.; Bekenev, V. L.; Chimitova, O. D.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bazarov, B. G.; Базаров Б. Г.; Bazarova, J. G.; Базарова Ж. Г.; Khuzhum, O. Y.; Lim, C. S.
}
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Surface bonding states of nano-crystalline diamond balls / J. L. Peng [et al.] // Int. J. Mod. Phys. B. - 2001. - Vol. 15, Is. 31. - P. 4071-4085, DOI 10.1142/S0217979201007865. - Cited References: 20 . - ISSN 0217-9792

РУБ Physics, Applied + Physics, Condensed Matter + Physics, Mathematical
Рубрики:
PLASMON RESPONSE
   POWDER
   SPECTROSCOPY
   MICROSCOPY
   SILICON
   SI(111)
Кл.слова (ненормированные):
diamond -- article -- crystal structure -- electron -- energy transfer -- nanoparticle -- particulate matter -- structure analysis -- surface property -- transmission electron microscopy
Аннотация: The rough surface of nano-crystalline diamond spheres induces surface electronic states which appear as a broadened pre-peak over approx. 15 eV at the C K-edge energy threshold for carbon in the parallel electron energy loss spectrum (PEELS). This appears to be at least partially due to 1s-pi* transitions, although typically the latter occupy a range of only 4 eV for the sp(2) edge of highly-oriented pyrollytic graphite (HOPG). No pi* electrons appear in the conduction band inside the diamond particles, where all electrons are sp(3) hybridized. PEELS data were also obtained from a chemical vapour deposited diamond film (CVDF) and gem-quality diamond for comparison with the spectra of nano-diamonds. The density of sp(2) and sp(3) states on the surface of diamond nano-crystals is calculated for simple structural models of the diamond balls, including some conjecture about surface structures. The results are used to interpret the sp(2)/sp(3) ratios measured from the PEELS spectra recorded as scans across the particles. Surface roughness at the atomic scale was also examined using high-resolution transmission electron microscopy (HRTEM) and electron nano-diffraction patterns were used to confirm the crystal structures.

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Держатели документа:
RMIT Univ, Dept Appl Phys, Melbourne, Vic 3051, Australia
Univ Sydney, Electron Microscope Unit, Sydney, NSW 2006, Australia
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Mol Architecture Grp, Krasnoyarsk 660036, Russia
Russian Acad Sci, Siberian Branch, Inst Biophys, Krasnoyarsk 660036, Russia
Univ Melbourne, Sch Phys, Parkville, Vic 3052, Australia
ИФ СО РАН
ИБФ СО РАН
Department of Applied Physics, RMIT University, Swanston Street, Melbourne, Vic. 3051, Australia
Electron Microscope Unit, University of Sydney, NSW 2006, Australia
Molecular Architecture Group, Kirensky Institute of Physics, Institute of Biophysics, 660036 Krasnoyarsk, Russian Federation
School of Physics, University of Melbourne, Parkville, Vic. 3010, Australia

Доп.точки доступа:
Peng, J. L.; Bulcock, S.; Belobrov, P. I.; Белобров, Петр Иванович; Bursill, L. A.
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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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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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    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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10.

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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11.

Raman spectra and pressure-induced lattice instabilities in RbMnCl3 crystal / A. N. Vtyurin [et al.] // 11th International Conference on Phonon Scattering in Condensed Matter (PHONONS 2004) (JUL 25-30, 2004, St Petersburg, RUSSIA) : WILEY-V C H VERLAG GMBH, 2004. - 11th International Conference on Phonon Scattering in Condensed Matter (PHONONS 2004) (JUL 25-30, 2004, St Petersburg, RUSSIA). - P. 3097-3100, DOI 10.1002/pssc.200405332. - Cited References: 14 . - ISBN 3-527-40588-7

РУБ Physics, Condensed Matter
Рубрики:
PHASE-TRANSITION
SPECTROSCOPY
Кл.слова (ненормированные):
Frequencies -- Hydrostatic pressure -- Mathematical models -- Parameter estimation -- Raman scattering -- Spectrometers -- Stability -- Ambient conditions -- Anomalies -- Lattice instabilities -- Structural units -- Rubidium compounds
Аннотация: Raman scattering spectra of the RbMnCl3 crystal have been studied under ambient conditions and under high hydrostatic pressure. The results produced have been interpreted with the ab initio model. The experimental data agree well with the estimated values in the low frequency range and show a slightly worse agreement at higher frequencies. A phase transition from the hexagonal phase to the perovskite phase predicted earlier within the same model was observed under high pressure (above 0.7 GPa) and new transitions to lower symmetry phases were found at higher pressures (1.1 GPa and 5 GPa). (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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Держатели документа:
Kirensky Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Inst. of Mineralogy and Petrography, 630090 Novosibirsk, Russian Federation

Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Goryainov, S. V.; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Shefer, A. D.; Zamkova, N. G.; Замкова, Наталья Геннадьевна; Zinenko, V. I.; Зиненко, Виктор Иванович
}
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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.

    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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14.

Ovchinnikov, S. G.
Density of hole-doped states in strongly correlated electron-systems of copper oxides / S. G. Ovchinnikov // Phys. Rev. B. - 1994. - Vol. 49, Is. 14. - P. 9891-9897, DOI 10.1103/PhysRevB.49.9891. - Cited References: 34 . - ISSN 0163-1829

РУБ Physics, Condensed Matter
Рубрики:
DYNAMIC PROPERTIES
   SUPERCONDUCTIVITY
   GAP
   LA2CUO4
   BI2SR2CACU2O8
   PHOTOEMISSION
   SPECTROSCOPY
   SPECTRA
   MODEL
   BAND
Аннотация: A generalized tight-binding method to calculate quasiparticle band structure and density of states in strongly correlated systems is presented. The band structures of undoped and weakly hole-doped CuO2 layer are calculated. The insulator gap has a charge transfer nature with a minor contribution from a Cu-O Coulomb interaction. Doping results in the appearance of an in-gap state with a simultaneous decrease of the density of states at the band edges in agreement with small cluster results and experimental data.

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Держатели документа:
L. V. Kyrensky Institute of Physics, Siberian Branch of Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Овчинников, Сергей Геннадьевич
}
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15.

Optical spectra, crystal-field parameters, and magnetic susceptibility of multiferroic NdFe3(BO3)(4) / M. N. Popova [et al.] // Phys. Rev. B. - 2007. - Vol. 75, Is. 22. - Ст. 224435, DOI 10.1103/PhysRevB.75.224435. - Cited References: 22 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
IRON BORATE GDFE3(BO3)(4)
   CRYSTALLIZATION
   SPECTROSCOPY
   LASER
   ND3+
Аннотация: We report high-resolution optical absorption spectra for NdFe3(BO3)(4) trigonal single crystal, which is known to exhibit a giant magnetoelectric effect below the temperature of magnetic ordering T-N=33 K. The analysis of the temperature-dependent polarized spectra reveals the energies and, in some cases, symmetries and exchange splittings of Nd3+ 84 Kramers doublets. We perform crystal-field calculations starting from the exchange-charge model, obtain a set of six real crystal-field parameters, and calculate wave functions and magnetic g factors. In particular, the values g(perpendicular to)=2.385 and g(parallel to)=1.376 were found for the Nd3+ ground-state doublet. We obtain B-loc=7.88 T and parallel to J(FN)parallel to=0.48 K for the values of the local effective magnetic field at liquid-helium temperatures at the Nd3+ site and the Nd-Fe exchange integral, respectively, using the experimentally measured Nd3+ ground-state splitting of 8.8 cm(-1). To check the reliability of our set of crystal-field parameters, we model the magnetic susceptibility data from literature. A dimer containing two nearest-neighbor iron ions in the spiral chain is considered to partly account for quasi-one-dimensional properties of iron borates, and then the mean-field approximation is used. The results of calculations with the exchange parameters for Fe3+ ions J(nn)=-6.25 K (intrachain interactions) and J(nnn)=-1.92 K (interchain interactions) obtained from fitting agree well with the experimental data.

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Держатели документа:
Russian Acad Sci, Inst Spect, Troitsk 142190, Moscow Region, Russia
Kazan VI Lenin State Univ, Kazan 420008, Russia
Ecole Natl Super Chim Paris, CNRS, UMR7574, Lab Chim Appl & Etat Solide, F-75231 Paris, France
Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119992, Russia
RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institute of Spectroscopy, Russian Academy of Sciences, 142190 Troitsk, Russian Federation
Kazan State University, 420008 Kazan, Russian Federation
Laboratoire de Chimie Applique'e de l'E Tat Solide, CNRS-UMR7574, ENSCP, 11, Rue Pierre et Marie Curie, F-75231 Paris Cedex 05, France
Physics Faculty, Moscow State University, 119992 Moscow, Russian Federation
L.V. Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Popova, M. N.; Chukalina, E. P.; Stanislavchuk, T. N.; Malkin, B. Z.; Zakirov, A. R.; Antic-Fidancev, E.; Popova, E. A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Temerov, V. L.; Темеров, Владислав Леонидович
}
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16.

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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17.

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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18.

Magneto-optical activity of crude oil and its heavy fractions / A. E. Sokolov [et al.] // Opt. Spectrosc. - 2012. - Vol. 112, Is. 5. - P. 755-762, DOI 10.1134/S0030400X12050165. - Cited References: 18. - This work was performed under Interdisciplinary Integration Project no. 118 of the Siberian Branch of the Russian Academy of Sciences (2009-2011). . - ISSN 0030-400X

РУБ Optics + Spectroscopy
Рубрики:
MAGNETIC CIRCULAR-DICHROISM
   SINGLE-CRYSTALS
   SPECTROSCOPY
   EPR
   ABSORBENCY
   PORPHYRIN
   SYSTEMS
Аннотация: We have experimentally studied optical and magneto-optical spectra of solutions of crude oils of different origin and their heavy fractions in the visible spectral range. Magnetic circular dichroism of oil in the wavelength range similar to 550 nm has been revealed. We show that the shape of the spectra of this dichroism depends on the origin of crude oil, with the magnetic dichroism magnitude being proportional to the concentration of the oil in the solution. A comparison of the data of magneto-optical spectroscopy with electron paramagnetic resonance spectra and chemical composition of samples has allowed us to conclude that the observed magneto-optical activity is determined by the occurrence of VO2+ complexes in the oil samples. The revealed magneto-optical activity of crude oil can form the basis of a unique method of analysis of the composition and properties of oils of different origin and heavy fractions thereof.

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Публикация на русском языке Магнитооптическая активность природной нефти и ее тяжелых фракций [Текст] / А. Э. Соколов [и др.] // Оптика и спектроскопия : Наука, 2012. - Т. 112 № 5. - С. 820-827

Держатели документа:
[Sokolov, A. E.
Edelman, I. S.
Zabluda, V. N.
Petrakovskaya, E. A.
Aleksandrovskii, A. S.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Shubin, A. A.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Trukhan, S. N.
Mart'yanov, O. N.] Russian Acad Sci, Siberian Branch, Boreskov Inst Catalysis, Novosibirsk 630090, Russia

Доп.точки доступа:
Sokolov, A. E.; Соколов, Алексей Эдуардович; Edelman, I. S.; Эдельман, Ирина Самсоновна; Zabluda, V. N.; Заблуда, Владимир Николаевич; Petrakovskaya, E. A.; Петраковская, Элеонора Анатольевна; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Shubin, A. A.; Trukhan, S. N.; Mart'yanov, O. N.
}
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19.

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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20.

Magnetic circular dichroism and optical absorption in TmAl3(BO3)(4) / A. V. Malakhovskii [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 1. - P. 34-38, DOI 10.1134/S1063783407010076. - Cited References: 19 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
SINGLE-CRYSTALS
   SPECTROSCOPY
   TRANSITIONS
   HUNTITE
   GROWTH
Аннотация: The polarized spectra of absorption and magnetic circular dichroism in a TmAl3(BO3)(4) single crystal are studied in the re-ion of H-3(6) - F-3(4), H-3(6) - F-3(3),and H-3(3) - F-3(2) electronic transitions in e Tm3+ ion. The structure of the spectra is interpreted qualitatively. It is shown that the magnetic circular dichroism of the H-3(6) - F-3(4) transition is determined by the contribution from the splitting of the ground state, whereas the magnetic circular dichroism of the H-3(6) - F-3(3) transition is governed by the contribution from the splitting of an excited state in a trigonal crystal field.

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Sokolov, A. E.; Соколов, Алексей Эдуардович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Temerov, V. L.; Темеров, Владислав Леонидович; Stolbovaya, N. A.; Edelman, I. S.; Эдельман, Ирина Самсоновна
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