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Phonon softening and atomic modulations in EuAl4 / A. N. Korshunov, A. S. Sukhanov, S. Gebel [et al.] // Phys. Rev. B. - Vol. 110, Is. 4. - Ст. 045102, DOI 10.1103/PhysRevB.110.045102. - Cited References: 52. - We thank Dr. Anton Kulbakov (TU Dresden) for useful discussions. The experimental work was performed at endstation ID28 of the European Synchrotron Radiation Facility (ESRF). Work at TUD was supported by the German Research Foundation (DFG) through the CRC1143 (Project-id 247310070) and the Würzburg-Dresden Cluster of Excellence ct.qmat (EXC2147, Project-id 390858490). M.C.R. is grateful for support through the Emmy-Noether programme of the DFG (Project-id 501391385). A.K. acknowledges the Education Department of the Basque Government (Grant No. PIBA_2023_1_0051). S.G. is grateful for support through a scholarship from the German Academic Exchange Service (DAAD), Project-id 57646454) . - ISSN 2469-9950. - ISSN 2469-9969
Аннотация: EuAl4 is a rare-earth intermetallic in which competing itinerant and/or indirect exchange mechanisms give rise to a complex magnetic phase diagram, including a centrosymmetric skyrmion lattice. These phenomena arise not in the tetragonal parent structure but in the presence of a charge-density wave (CDW), which lowers the crystal symmetry and renormalizes the electronic structure. Microscopic knowledge of the corresponding atomic modulations and their driving mechanism is a prerequisite for a deeper understanding of the resulting equilibrium of electronic correlations and how it might be manipulated. Here, we use synchrotron single-crystal x-ray diffraction, inelastic x-ray scattering, and lattice-dynamics calculations to clarify the origin of the CDW in EuAl4. We observe a broad softening of a transverse acoustic phonon mode that sets in well above room temperature and, at TCDW = 142 K, freezes out in an atomic displacement mode described by the superspace group Immm(00γ )s00. In the context of previous work, our observation is a clear confirmation that the CDW in EuAl4 is driven by electron-phonon coupling. This result is relevant for a wider family of BaAl4 and ThCr2Si2- type rare-earth intermetallics known to combine CDW instabilities and complex magnetism.

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Держатели документа:
Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal, 20018 San Sebastian, Spain
Institut fur Festkorper- und Materialphysik, Technische Universitat Dresden, D-01069 Dresden, Germany
Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, 13083-970 Sao Paulo, Brazil
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA
Rice Center for Quantum Materials (RCQM), Rice University, Houston, Texas 77005, USA
Applied Physics Graduate Program, Smalley-Curl Institute, Rice University, Houston, Texas 77005, USA
Department of Chemistry, Princeton University, Princeton, NJ 08544, USA

Доп.точки доступа:
Korshunov, A. N.; Sukhanov, A. S.; Gebel, S.; Pavlovskii, M. S.; Павловский, Максим Сергеевич; Andriushin, N. D.; Gao, Y.; Moya, J. M.; Morosan, E.; Rahn, M. C.
}
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Nanostructured coatings of 3d-metals produced by green chemistry methods: Analysis of inhomogeneities by static and dynamic magnetic methods / I. G. Vazhenina, S. V. Stolyar, S. V. Komogortsev [et al.] // Phys. Met. Metallogr. - 2024. - Vol. 125, Is. 4. - P. 363-370, DOI 10.1134/S0031918X24600088. - Cited References: 30. - The research was conducted as part of the scientific topic of the State Assignment of the Federal Research Center Krasnoyarsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences . - ISSN 0031-918X. - ISSN 1555-6190
Кл.слова (ненормированные):
coating -- chemical deposition -- magnetization curves -- ferromagnetic resonance -- heterogeneous structures -- magnetic anisotropy
Аннотация: The study investigates carbon-containing coatings of 3d-metals (Ni, Co, Fe) produced by chemical deposition method using arabinogalactan. The coatings were analyzed using X-ray diffraction, FMR, and M(H) magnetometry. Measurement of M(H) in plane and perpendicular to the plane of the magnetic coatings allowed determining the distribution of demagnetizing factor in the studied coatings. The obtained distributions of the demagnetizing factor were used to analyze the angular dependences of the ferromagnetic resonance field. The values of magnetization and perpendicular anisotropy field were estimated. The paper illustrates the effect of texture on the magnetic parameters.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036 Russia
Siberian Federal University, Krasnoyarsk, 660041 Russia
Federal Research Center Krasnoyarsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, 660036 Russia
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, 660037 Russia

Доп.точки доступа:
Vazhenina, I. G.; Важенина, Ирина Георгиевна; Stolyar, S. V.; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Li, O. A.; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Cheremiskina, E. V.; Nemtsev, I. V.; Немцев, Иван Васильевич
}
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Variable spatial dynamics of optical vortices produced by a double fork-shaped grating / E. C. Darmaev, D. A. Ikonnikov, S. A. Myslivets [et al.] // Ann. Phys. - 2024. - Ст. 2400120, DOI 10.1002/andp.202400120. - Cited References: 31 . - Article in press. - ISSN 0003-3804. - ISSN 1521-3889
Кл.слова (ненормированные):
binary phase holograms -- optical vortices -- orbital angular momentum -- topological charge
Аннотация: Light diffraction is studied numerically and experimentally on a double fork-shaped grating representing a periodic grating containing two spaced dislocations. The spatial dynamics of the phase singularities (optical vortices) has been investigated as a function of dislocation parameters. Produced optical vortices affect each other while propagating in a free space. For dislocations of the same topological charge, the propagation trajectories and their transverse displacement coordinates depend on the dislocation spacing, and the larger the dislocation spacing, the smaller the relative displacement of the optical vortices and the smaller their trajectory curvatures. For oppositely charged dislocations, three types of spatial behavior of optical vortices are found. The numerical results agree well with the experimental data.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Institute of Engineering Physics and Radio Electronics, Siberian Federal Universiry, Krasnoyarsk, 660041, Russia

Доп.точки доступа:
Darmaev, E. C.; Дармаев Э. Ч.; Ikonnikov, D. A.; Иконников, Денис Андреевич; Myslivets, S. A.; Мысливец, Сергей Александрович; Arkhipkin, V. G.; Архипкин, Василий Григорьевич; Vyunishev, A. M.; Вьюнышев, Андрей Михайлович
}
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Achieving ultra-broadband sunlight-like emission in single-phase phosphors: The interplay of structure and luminescence / Sh. Liu, L. Li, X. Qin [et al.] // Adv. Mater. - 2024. - Ст. 2406164, DOI 10.1002/adma.202406164. - Cited References: 43. - S.L. and L.L. contributed equally to this work. This work was ﬁnancially supported by grants from the National Natural Science Foundationof China (NSFC, No. 52272174) and its joint project with Guangdong(Nos. U22A20135, U1801253 and U1301242) Province. J. Wang acknowl-edges Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) projects SML2021SP204, SML2023SP215/218/238. The authorsare grateful to Prof. Peter A. Tanner and Prof. Ka-Leung Wong for the indepth communication and valuable advice on the improvement of the manuscript. - Open access funding provided by Ecole Polytechnique Federale de Lausanne . - Article in press. - ISSN 0935-9648. - ISSN 1521-4095
Кл.слова (ненормированные):
artificial light source -- Ca9LiMg1-xAl2x/3(PO4)7:0.1Eu2+ -- convolutional neural network analysis -- mimicking sunlight -- portable photodetection devices
Аннотация: The quest for artificial light sources mimicking sunlight has been a long-standing endeavor, particularly for applications in anticounterfeiting, agriculture, and color hue detection. Conventional sunlight simulators are often cost-prohibitive and bulky. Therefore, the development of a series of single-phase phosphors Ca9LiMg1-xAl2x/3(PO4)7:0.1Eu2+ (x = 0-0.75) with sunlight-like emission represents a welcome step towards compact and economical light source alternatives. The phosphors are obtained by an original heterovalent substitution method and emit a broad spectrum spanning from violet to deep red. Notably, the phosphor with x = 0.5 exhibits an impressive full width at half-maximum of 330 nm. A synergistic interplay of experimental investigations and theory unveils the mechanism behind sunlight-like emission due to the local structural perturbations introduced by the heterovalent substitution of Al3+ for Mg2+, leading to a varied distribution of Eu2+ within the lattice. Subsequent characterization of a series of organic dyes combining absorption spectroscopy with convolutional neural network analysis convincingly demonstrates the potential of this phosphor in portable photodetection devices. Broad-spectrum light source testing empowers the model to precisely differentiate dye patterns. This points to the phosphor being ideal for mimicking sunlight. Beyond this demonstrated application, the phosphor's utility is envisioned in other relevant domains, including visible light communication and smart agriculture.

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Держатели документа:
School of Chemical Engineering and Technology/School of Marine Sciences, Sun Yat-sen University, Zhuhai 519082, P. R. China
College of Materials, Xiamen University, Xiamen 361005, P. R. China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center SB RAS, Akademgorodok 50 bld.38, Krasnoyarsk 660036, Russia
International Research Center of Spectroscopy and Quantum Chemistry-IRC SQC, Siberian Federal University, 79 Svobodny Ave, Krasnoyarsk 660041, Russia
Institute of Sustainability for ChemicalsEnergy and Environment (ISCE2) Agency for ScienceTechnology and Research (A*STAR), 1 Pesek Road, Jurong Island 627833, Singapore
Institute of Chemical Sciences and Engineering Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, Switzerland

Доп.точки доступа:
Liu, Sh.; Li, L.; Qin, X.; Du, R.; Sun, Y.; Xie, Sh.; Wang, J.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xi, Sh.; Bunzli, J.-C. G.; Zhou, L.; Wu, M.
}
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    Synergetic manipulation of components and multiple activator sites towards full-spectrum lighting in Eu2+-doped whitlockite phosphors for high color-rendering WLED / H. Chen, Z. Zhang, R. Mi [et al.] // J. Lumin. - 2024. - Vol. 275. - Ст. 120795, DOI 10.1016/j.jlumin.2024.120795. - Cited References: 47. - We acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 52104272 and 52072348), the Young Elite Scientists Sponsorship Program by CAST (2024QNRC001) and the Program National Key R&D Program of China (2021YFC1910602-01) . - ISSN 0022-2313. - ISSN 1872-7883
   Перевод заглавия: Синергетическое манипулирование составом и множеством позиций активаторов для обеспечения широкоспектрального освещения в витлокитовых люминофорах, легированных Eu2+, для высокой цветопередачи белых светодиодов
Кл.слова (ненормированные):
Components regulation -- Multi-site occupancies -- Whitlockite phosphors -- Eu -- High color rendering
Аннотация: Tuning the components and multiple activator sites possesses profound significances on the regulation for corresponding luminescent properties of target phosphors. However, it is still challenging to realize full-visible emission via single activator in a single phase owing to the matrix diversity and uncertainty for multi-site occupation. Herein, we developed a family of whitlockite-type solid-solution phosphors Ca8MgGa1-yLay(PO4)7: Eu2+(y = 0–1) via inducing the La3+ ions into Ca8MgGa(PO4)7:Eu2+. The local environments of Eu2+ ions and corresponding tunable photoluminescent properties, decay times and thermal stability are revealed systematically in detail. Specially, the excitation and emission spectra of Ca8MgGa1-yLay(PO4)7: Eu2+ are broadened gradually, finally towards a full-visible emission with 152 nm bandwidth spectrum for the phosphor Ca8MgLa(PO4)7: Eu2+. WLED with a high color rendering index (CRI = 95) and low color temperature (CCT = 3764 K) was fabricated based on the full-visible emission Ca8MgGa0.2La0.8(PO4)7: 0.08Eu2+ phosphors under a 365 nm chip, indicating the prominent potentials for high-color-rendering WLEDs. These results in current work provide new ideas for synergetic manipulation of components and multiple activator sites towards a full-visible emission in single-phase applied for white lighting.

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Держатели документа:
Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), 100083, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
Siberian Federal University, Krasnoyarsk, 660041, Russia
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russia
School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, 241000, China

Доп.точки доступа:
Chen, H.; Zhang, Z.; Mi, R.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Liu, Yu.; Wang, B.; Mei, L.; Fang, M.; Wu, X.; Min, X.; Liu, Ya.
}
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Superparamagnetic relaxation in ensembles of ultrasmall ferrihydrite nanoparticles / Yu. V. Knyazev, D. A. Balaev, S. A. Skorobogatov [et al.] // Phys. Met. Metallogr. - 2024. - Vol. 125, Is. 4. - P. 377-385, DOI 10.1134/S0031918X23603025. - Cited References: 56. - The work was conducted as part of the state assignment of the Kirensky Institute of Physics SB RAS, while the synthesis of biogenic ferrihydrite was carried out as part of the state assignment of the Krasnoyarsk Scientific Center SB RAS . - ISSN 0031-918X. - ISSN 1555-6190
Кл.слова (ненормированные):
superparamagnetism -- relaxation -- ferrihydrite
Аннотация: The paper examines the impact of interparticle interactions on the superparamagnetic relaxation of ultrasmall nanoparticle ensembles, using Fe2O3•nH2O iron oxyhydroxide (ferrihydrite) nanoparticles as an example. Two samples were analyzed: ferrihydrite of biogenic origin (with an average particle size of ≺d≻ ≈ 2.7 nm) with a natural organic shell, and a sample (with ≺d≻ ≈ 3.5 nm) that underwent low-temperature annealing, during which the organic shell was partially removed. The DC and AC magnetic susceptibilities (χ'(T), χ''(T)) in a small magnetic field in the superparamagnetic (SPM) blocking region of the nanoparticles were measured. The results show that an increase in interparticle interactions leads to an increase in the SPM blocking temperature from 28 to 52 K according to DC magnetization data. It is shown that below the SPM blocking temperature, magnetic interactions of nanoparticles lead to the formation of a collective state similar to spin glass in bulk materials. The scaling approach reveals that the dynamics of correlated magnetic moments on the particle surface slow down with increasing interparticle interactions. Simulation of χ''(T) dependence has shown that the dissipation of magnetic energy occurs in two stages. The first stage is directly related to the blocking of the magnetic moment of nanoparticles, while the second stage reflects the spin-glass behavior of surface spins and strongly depends on the strength of interparticle interactions.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center (FRC), KSC SB RAS, Krasnoyarsk, 660036 Russia
FRC Krasnoyarsk Scientific Center (KSC), Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, 660036 Russia

Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Balaev, D. A.; Балаев, Дмитрий Александрович; Skorobogatov, S. A.; Скоробогатов, Станислав Алексеевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Stolyar, S. V.; Столяр, Сергей Викторович; Ladygina, V. P.; Krasikov, A. A.; Красиков, Александр Александрович; Iskhakov, R. S.; Исхаков, Рауф Садыкович
}
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Properties of La2F4Se, B–LaFSe phases. Phase diagram of the LaF3–La2Se3 system / V. M. Grigorchenko, M. S. Molokeev, I. O. Yurev [et al.] // J. Solid State Chem. - 2024. - Vol. 338. - Ст. 124880, DOI 10.1016/j.jssc.2024.124880. - Cited References: 45. - This research was funded by the Tyumen Oblast Government as part of the West-Siberian Interregional Science and Education Center's project No. 89-DON (3). - This study was funded by the Russian Science Foundation, project No. 23-23-00488 "Search for EMF generation conditions in gradient ceramics of samarium monosulfide (SmS)". - The authors are grateful to I.V. Palamarchuk, a research engineer at the Center for Collective Use “Rational Nature Management and Physico-Chemical Research" of Tyumen State University, for measuring the diffusion spectrum of reflections of samples. A.S.A, A.S.O and A.S.K are grateful for the state assignment funding from Kirensky Institute of Physics . - ISSN 0022-4596. - ISSN 1095-726X
Кл.слова (ненормированные):
Lanthanum selenidofluoride -- Band gap -- Phase diagram -- Incongruent melting
Аннотация: Lanthanum selenidofluorides belong to wide-gap semiconductors and are promising for optoelectronics. La2F4Se, B–LaFSe compounds were obtained by the ampoule method from binary compounds. Crystals La2F4Se, R-3m, a = 4.18245(11) Å, c = 23.2939(6) Å, Z = 3, B–LaFSe P63/mmc, a = 4.21989(5) Å, c = 8.19140(10) Å, Z = 2 have a layered grain structure, their microhardnesses are 340 and 450 HV, which allows samples processing. The optical bandgap of La2F4Se is 4.5 eV. The optical bandgaps of La2F4Se and B–LaFSe were analyzed by comparing the calculated absorption spectra and the experimental Kubelka-Munk Functions. It was shown that this approach is attractive in explaining optical properties in the vicinity of fundamental absorption onset and in neighboring regions. In LaF3–La2Se3 system, temperatures and enthalpies of five phase transformations were determined, and their balance equations were obtained. It was shown that La2F4Se, B–LaFSe compounds melt incongruently and that an eutectic is formed between the phases. A phase diagram of LaF3–La2Se3 system was constructed. The liquidus calculated by Redlich-Kister polynomial agrees with the data of differential scanning calorimetry.

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Держатели документа:
Tyumen State University, Tyumen, Volodarsky str. 6, 625003, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Akademgorodok str. 50, building 38, 660036, Russia
Siberian Federal University, Krasnoyarsk, Svobodnyj av. 79, 660079, Russia
Kurgan State University, Sovetskaya str. 63/4, Kurgan, 640020, Russia
Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Pervomaiskaya str. 91, 620990, Russia

Доп.точки доступа:
Grigorchenko, V.M.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Yurev, I.O.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Krylov, A. S.; Крылов, Александр Сергеевич; Nesterova, N.V.; Kamaev, D.N.; Elyshev, A.V.; Andreev, O.V.
}
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Synthesis, crystal structure, and magnetic properties of Ni2CrBO5 / N. A. Belskaya, E. V. Eremin, A. D. Vasiliev [et al.] // J. Magn. Magn. Mater. - 2024. - Vol. 604. - Ст. 172298, DOI 10.1016/j.jmmm.2024.172298. - Cited References: 75. - The authors acknowledge A. Borus for the electrical resistivity measurements. The X-ray diffraction, magnetic, and specific heat measurements were carried out in the Common Access Facility Center of SB RAS (Krasnoyarsk, Russia) and P.N. Lebedev Physical Institute of RAS (Moscow, Russia). - Research is supported by the Russian Science Foundation and Krasnoyarsk Regional Fund of Science and Technology Support, grant No. 24-12-20012, https://rscf.ru/project/24-12-20012/ . - ISSN 0304-8853. - ISSN 1873-4766
Кл.слова (ненормированные):
Oxyborates -- Cationic distribution -- Magnetic phase transitions -- Specific heat
Аннотация: Ni2CrBO5 has been synthesized and investigated by X-ray diffraction, dc magnetization, and specific heat measurements. The unusual cation distribution has been established: the M1 and M3 sites are occupied by Ni2+ ions, the M2 site is by Cr3+ ions, and the M4 site is mixed, featuring both Ni2+ and Cr3+ ions. The magnetic order onsets at TN= 140 K, which is confirmed by a λ-type peak in specific heat, followed by the dome-shaped anomaly of the magnetization at about 30 K. In the magnetically ordered state, a remarkable sequence of temperature-induced magnetization reversal sensitive to the measurement’s regime is observed. Dominant antiferromagnetic interactions are characterized by the Weiss temperature θ= −73 K. The effective magnetic moment of 5.37 μB per formula unit is close to the spin-only one. The effect of the cation distribution on the magnetic properties is discussed.

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Держатели документа:
Ioffe Institute, Polytechnicheskaya street, 26, St.-Petersburg, 194021, Russia
Kirensky Institute of Physics, Akademgorodok 50, bld. 38, Krasnoyarsk, 660036, Russia
Reshetnev Siberian State University of Science and Technology, 31, Krasnoyarsky Rabochy Av., Krasnoyarsk, 660037, Russia
Lebedev Physical Institute, Russian Academy of Sciences, Leninskiy pr., 14, Moscow, 119991, Russia
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Akademgorodok 50, bld. 24, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Belskaya, N.A.; Eremin, E. V.; Еремин, Евгений Владимирович; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Gavrilkin, S.Yu.; Vereshchagin, S.N.; Chikurov, D.S.; Krasilin, A.A.; Kazak, N. V.; Казак, Наталья Валерьевна
}
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Photophysical properties of luminophores based on 3-(1,3-benzothiazol-2-yl)-4-hydroxybenzenesulfonic acid / E. V. Parfenova, N. V. Slyusarenko, S. V. Kulagin [et al.] // Bull. Russ. Acad. Sci.: Phys. - 2024. - Vol. 88, Is. 6. - P. 940-945, DOI 10.1134/S1062873824706858. - Cited References: 25. - The authors are grateful to OLBO Company for the presented samples. - The work was supported by the Priority 2030 Program, the project "Design of New Luminescent Materials for Multifunctional Purposes", and the Grant Council of the President of the Russian Federation (project no. MK-995.2022.1.2) . - ISSN 1062-8738. - ISSN 1934-9432
Кл.слова (ненормированные):
luminophores -- anomalously large Stokes shift -- excited state intramolecular proton transfer -- luminescence -- quantum yield -- quantum chemical calculation -- density functional theory -- electronic spectrum
Аннотация: Water-soluble organic luminophores based on 3-(1,3-benzothiazol-2-yl)-4-hydroxybenzenesulfonic acid were studied both experimentally and by density functional theory for the first time. Because of peculiarities in chemical structure, one of them has a large Stokes shift, which results from excited state intramolecular proton transfer.

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Держатели документа:
Siberian Federal University, Krasnoyarsk, 660041 Russia
OLBO, Moscow, 107143 Russia
Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Scientific Center”, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia

Доп.точки доступа:
Parfenova, E. V.; Slyusarenko, N. V.; Kulagin, S. V.; Rogova, A. V.; Tomilin, F. N.; Томилин, Феликс Николаевич; Slyusareva, E. A.
}
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10.

Magnetic properties and magnetoresistance of hybrid multilayer nanostructures {[(Co40Fe40B20)34(SiO2)66]/[ZnO]}n / Y. E. Kalinin, A. V. Sitnikov, V. A. Makagonov [et al.] // J. Magn. Magn. Mater. - 2024. - Vol. 604. - Ст. 172287, DOI 10.1016/j.jmmm.2024.172287. - Cited References: 36. - The work was carried out with the support of the Ministry of Science and Higher Education of the Russian Federation within the framework of a state assignment (project No. FZGM-2023-0006) . - ISSN 0304-8853. - ISSN 1873-4766
Кл.слова (ненормированные):
Hybrid multilayers -- Nanostructures -- Magnetization -- Negative magnetoresistance
Аннотация: The structural, electrical, magnetic, magneto-optical properties and magnetoresistance of {[(Co40Fe40B20)34(SiO2)66]/[ZnO]}n multilayer structures, where n = 50 is the number of bilayers (Co40Fe40B20)34(SiO2)66 nanocomposite and ZnO have been studied. The thicknesses of (Co40Fe40B20)34(SiO2)66 nanocomposite layers as well as ZnO spacers were varied in a wide range. The samples were synthesized by ion-beam sputtering onto glass ceramic substrates. The (Co40Fe40B20)34(SiO2)66 composite have an amorphous structure and the semiconductor ZnO interlayers have a hexagonal crystalline structure with the p63mc symmetry group. The nanocomposite layers containing a ferromagnetic component far from the percolation threshold are in a superparamagnetic state. The presented in the paper data of magnetization, magneto-optical transverse Kerr effect and magnetoresistance indicates that long-range ferromagnetic order does not form down to 77 K both for references ZnO films and studied multilayers with thin and thick ZnO interlayers. An increase in the magneto-optical signal in multilayers compared to references (Co40Fe40B20)34(SiO2)66 composite films has been detected at 1.2 eV. The magnetoresistance of {[(Co40Fe40B20)34(SiO2)66]/[ZnO]}n multilayers with thick (>32 nm) ZnO interlayers is lower than in reference (Co40Fe40B20)34(SiO2)66 nanocomposite, while at thin ZnO interlayers magnetoresistance is significantly higher and reaches 12 % at temperatures of 77 К. Possible mechanisms of ferromagnetic and antiferromagnetic ordering, enhancement of the magneto-optical response and magnetoresistance in {[(Co40Fe40B20)34(SiO2)66]/[ZnO]}n multilayer nanostructures are discussed.

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Держатели документа:
Voronezh State Technical University, 394006 Voronezh, Russia
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russia
Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
National Research Center Kurchatov Institute, 123182 Moscow, Russia

Доп.точки доступа:
Kalinin, Y.E.; Sitnikov, A.V.; Makagonov, V.A.; Foshin, V.A.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Pripechenkov, I.M.; Perova, N.N.; Ganshina, E.A.; Rylkov, V.V.; Granovsky, A.B.
}
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11.

Kolovsky, A. R.
Deriving Landauer's formula by using the master equation approach / A. R. Kolovsky // Europhys. Lett. - 2024. - Vol. 146, Is. 6. - Ст. 61001, DOI 10.1209/0295-5075/ad56c3 . - ISSN 0295-5075. - ISSN 1286-4854
Аннотация: We revisit the problem of two-terminal transport of non-interacting Fermi particles in a mesoscopic device. First, we generalize the transport problem by taking into consideration relaxation processes in contacts (which are characterized by the contact self-thermalization rate γ) and then solve it by using the master equation approach. In the limit γ→0 the obtained results are shown to reproduce those of the Landauer theory. Thus, the presented analysis proves correspondence between the Landauer and master equation approaches to quantum transport —a problem which has been waiting for a solution for decades.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS - 660036, Krasnoyarsk, Russia
School of Engineering Physics and Radio Electronics, Siberian Federal University - 660041, Krasnoyarsk, Russia

Доп.точки доступа:
Коловский, Андрей Радиевич
}
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12.

Мартынов, Сергей Николаевич.
Анизотропные обменные взаимодействия в ферромагнетике PbMnBO4 / С. Н. Мартынов // Письма в ЖЭТФ. - 2024. - Т. 119, Вып. 11. - С. 847-853, DOI 10.31857/S1234567824110119. - Библиогр.: 43. - Автор благодарен А. И. Панкрацу, В. И. Зиненко и С. Н. Крыловой за полезные обсуждения работы . - ISSN 0370-274X
Аннотация: Численной минимизацией энергии основного состояния в приближении классических магнитных моментов рассчитана полевая зависимость намагниченности вдоль трудных направлений для четырехподрешеточного ферромагнетика PbMnBO4. Из сравнения с экспериментальными кривыми намагниченности получены значения параметров анизотропных взаимодействий: констант одноионной анизотропии второго порядка, величины и направления вектора антисимметричного обмена и значения тензора симметричного анизотропного обмена. Направление вектора взаимодействия Дзялошинского-Мория близко к орторомбической оси c. Тензор симметричного обмена имеет почти одноосный вид с направлением легкой оси ортогонально вектору антисимметричного обмена. Рассчитаны изменения энергии каждого анизотропного взаимодействия в процессе переориентации намагниченности.

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РИНЦ

Переводная версия Martynov S. N. Anisotropic exchange interactions in a ferromagnet PbMnBO4 [Текст] / S. N. Martynov. - 6 с. // JETP Lett. - 2024. - Vol. 119 Is. 11.- P.879-884

Держатели документа:
Институт физики им. Л. В. Киренского, Федеральный исследовательский центр "Красноярский научный центр Сибирского отделения Российской академии наук", 660036 Красноярск, Россия

Доп.точки доступа:
Martynov, S. N.
}
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13.

Small magnetic hysteresis in Bi2223 polycrystalline high-temperature superconductor / D. A. Balaev, S. V. Semenov, D. M. Gokhfeld, M. I. Petrov // J. Supercond. Nov. Magn. - 2024, DOI 10.1007/s10948-024-06802-w. - Cited References: 35 . - Article in press. - ISSN 1557-1939. - ISSN 1557-1947
Кл.слова (ненормированные):
BSCCO -- Polycrystalline high-temperature superconductor -- Magnetic hysteresis -- Critical state model -- Magnetic flux compression
Аннотация: Bi‒Sr‒Ca‒Cu‒O polycrystalline high-temperature superconductors with the 2–2-2–3 structure have been comprehensively studied, their properties have been described, and features of the small magnetic hysteresis in the investigated materials have been established. The small magnetic hysteresis is shown to be caused by the penetration of a magnetic flux into a superconductor and its capture in the region of boundaries between HTS crystallites and by Meissner currents flowing through these boundaries. It has been found that, at a certain magnetic prehistory, the small hysteresis collapses, i.e. its footprints disappear. This has been attributed to the interaction between two superconducting subsystems in the investigated polycrystalline HTS, specifically, the effect of the magnetic moments of HTS crystallites on the effective field in the regions of intercrystalline boundaries. The shape of the small magnetic hysteresis loop has been described within the critical state model.

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WOS
Держатели документа:
Siberian Branch, Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Russian Academy of Sciences, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Semenov, S. V.; Семёнов, Сергей Васильевич; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Petrov, M. I.; Петров, Михаил Иванович
}
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14.

Uniaxial negative thermal expansion in γ-LiBO2 with a closed-framework diamond-like structure / Zh. Liang, H. Zhou, Yu. Li [et al.] // Chem. Mater. - 2024. - Vol. 36, Is. 15. - P. 7299-7305, DOI 10.1021/acs.chemmater.4c01205. - Cited References: 61. - The authors would like to acknowledge Zhuohong Yin for useful discussions. This work was supported by the National Scientific Foundations of China (Grants T2222017, 12274425, 22375211, and 51890864) and the CAS Project for Young Scientists in Basic Research (YSBR-024). M.S.M. would like to acknowledge support from the Ministry of Science and High Education of the Russian Federation (Project No. FSRZ-2023-0006) . - ISSN 0897-4756. - ISSN 1520-5002
Аннотация: Negative-thermal-expansion (NTE) materials violate the common knowledge of “thermal expansion and cold contraction” in solids and embrace various physical mechanisms. In most phonon-driven NTE materials, an open-framework structure is necessary to accommodate the spatially anisotropic phonon excitations of the bridged atoms, but such a structural feature may result in structural instability at a high temperature. Herein, we focus on ?-LiBO2 with a closed-framework diamond-like structure and identify its uniaxial NTE behavior over the largest temperature range (100?850 K) among this structural family. As the temperature increases, the synergetic structural modification of the constituent structural groups, i.e., the stretching and bending of the Li?O bonds in floppy [LiO4] and the tension or rotation in the [BO4] group, accounts for NTE along the c-axis. Our study unveils that, apart from the anisotropic phonon excitations of individual atoms, the preferred phonon excitations of structural groups are also able to generate NTE, which would update the understanding of the NTE mechanism and guide the further exploration of phonon-driven NTE materials.

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WOS
Держатели документа:
Functional Crystals Laboratory, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Center of Materials Science and Optoelectronics Engineering, University of the ChineseAcademy of Sciences, Beijing 100049, China
University of the Chinese Academy of Sciences, Beijing 100049, China
Guangxi Key Laboratory of Superhard Materials, China Nonferrous Metals (Guilin) Geology and Mining Co., Ltd., Guilin 541004, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS,Krasnoyarsk 660036, Russia
International Research Center of Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk 660041, Russia
Department of Physics and Technical Sciences, Western Caspian University, Baku AZ 1001, Azerbaijan
Beijing Academy of Quantum Information Sciences, Beijing 100193, China

Доп.точки доступа:
Liang, Zh.; Zhou, H.; Li, Yu.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Plyaskin, M.; Liu, Yo.; Wu, R.; Jiang, X.; Zhang, Ch.; Lin, Zh.
}
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15.

    Оптические свойства, структурная однородность и дефектные центры монокристаллов двойного легирования LiNbO3:Zn:Mg, полученных по разным технологиям / Р. А. Титов, М. В. Смирнов, Л. А. Бобрева [и др.] // Перспективн. материалы. - 2024. - № 8. - С. 5-22, DOI 10.30791/1028-978X-2024-8-5-22. - Библиогр.: 60. - Работа выполнена при частичной финансовой поддержке правительства Мурманской области научно-исследовательских проектов молодых учёных (№ 201 от 27 ноября 2023 г.) и в рамках государственного задания Министерства науки и высшего образования РФ (регистрационный номер FMEZ-2022-0016) . - ISSN 1028-978X
   Перевод заглавия: Optical properties, structural homogeneity and defect centers of double-doped LiNbO3:Zn:Mg single crystals obtained using different technologies
Кл.слова (ненормированные):
кристалл ниобата лития -- двойное легирование -- OH-группы -- центры люминесценции -- точечные и комплексные дефекты -- спектроскопия КРС -- лазерная коноскопия -- фотоиндуцированное рассеяние света -- lithium niobate crystal -- double doping -- OH groups -- luminescence centers -- point and complex defects -- Raman spectroscopy -- laser conoscopy -- photoinduced light scattering
Аннотация: Методами спектроскопии комбинационного рассеяния света, инфракрасной спектроскопии поглощения, фотолюминесценции, лазерной коноскопии и фотоиндуцированного рассеяния света исследованы особенности дефектной структуры номинально чистого кристалла LiNbO3стех и монокристаллов двойного легирования LiNbO3:Zn:Mg (3,45:1,41 мол. %) и LiNbO3:Zn:Mg (3,45:1,22 мол. %), полученных по технологии гомогенного и прямого легирования. Кристаллы двойного легирования LiNbO3:Zn:Mg, полученные по разным технологиям, обладают высоким сопротивлением повреждению лазерным излучением. Кристалл LiNbO3:Zn:Mg (3,45:1,22 мол. %), полученный по технологии прямого легирования, характеризуется более низкой композиционной однородностью по сравнению с кристаллом LiNbO3:Zn:Mg (3,45:1,41 мол. %), полученным по технологии гомогенного легирования. По спектрам комбинационного рассеяния света обнаружено, что особенности дефектной структуры кристаллов двойного легирования LiNbO3:Zn:Mg в большей степени определяет примесь магния. Обнаруженный факт может быть причиной преобладания влияния упорядочивающего механизма катионов магния (~ 1,22 – 1,44 мол. %) над влиянием разупорядочивающего механизма катионов цинка (~ 3,45 мол. %) на особенности структурных единиц катионной подрешетки. Наименьшее значение концентрации ОН-групп и интенсивности фотолюминесценции в ближней ИК области характерно для кристалла LiNbO3:Zn:Mg (3,45:1,41 мол. %), полученного по технологии гомогенного легирования.
Features of the defect structure of a nominally pure LiNbO3stoich crystal and doubly doped LiNbO3:Zn:Mg (3.45:1.41 mol. %) and LiNbO3:Zn:Mg (3.45:1.22 mol. %) single crystals have been studied using Raman spectroscopy, infrared absorption spectroscopy, photoluminescence, laser conoscopy and photoinduced light scattering. The material for the study has been obtained using homogeneous and direct doping technology. It has been shown that double-doped LiNbO3:Zn:Mg crystals obtained using different technologies have high resistance to damage by laser radiation. However, the LiNbO3:Zn:Mg (3.45:1.22 mol. %) crystal obtained using direct doping technology is characterized by lower compositional uniformity compared to the LiNbO3:Zn:Mg (3.45:1.41 mol. %) crystal obtained using homogeneous doping technology. Raman spectra have showed that the features of the defect structure of double-doped LiNbO3:Zn:Mg crystals are largely determined by the magnesium impurity. This may be the reason that the influence of the ordering mechanism of magnesium cations (~ 1.22 – 1.44 mol. %) prevails over the influence of the disordering mechanism of zinc cations (~ 3.45 mol. %) on the features of the structural units of the cation sublattice. It has been found that the lowest concentration of OH groups and photoluminescence intensity in the near-IR region is characteristic of the LiNbO3:Zn:Mg (3.45:1.41 mol. %) crystal obtained using homogeneous doping technology.

Держатели документа:
Институт химии и технологии редких элементов и минерального сырья им. И.В. Тананаева — обособленное подразделение федерального государственного бюджетного учреждения науки Федерального исследовательского центра “Кольский научный центр Российской академии наук” (184209 Апатиты, Мурманская обл., ул. Академгородок, 26а)
Институт физики им. Л.В. Киренского Сибирского отделения Российской академии наук — обособленное подразделение Федерального государственного бюджетного научного учреждения “Федеральный исследовательский центр “Красноярский научный центр Сибирского отделения Российской академии наук” (660036 Красноярск, ул. Академгородок, 50, стр. 38)

Доп.точки доступа:
Титов, Р. А.; Смирнов, М. В.; Бобрева, Л. А.; Теплякова, Н. А.; Палатников, М. Н.; Бирюкова, И. В.; Маслобоева, С. М.; Крылов, Александр Сергеевич; Krylov, A. S.; Втюрин, Александр Николаевич; Vtyurin, A. N.; Сидоров, Н. В.
}
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16.

Kolovsky, A. R.
Effects of internal and external decoherence on the resonant transport and Anderson localization of fermionic particles in disordered tight-binding chains / A. R. Kolovsky // Phys. Rev. B. - 2024. - Vol. 110, Is. 3. - Ст. 035410, DOI 10.1103/PhysRevB.110.035410. - Cited References: 41. - This study was supported by the Ministry of Science and Higher Education of Russian Federation, Grant No. FSRZ-2023-0006 . - ISSN 2469-9950. - ISSN 2469-9969
Аннотация: We study the effects of relaxation/decoherence processes on quantum transport of noninteracting Fermi particles across the disordered tight-binding chain, where we distinguish between relaxation processes in the contacts (external decoherence) and those in the chain (internal decoherence). It is shown that external decoherence reduces conductance fluctuations but does not alter the Anderson localization length. This is in strong contrast with the effect of internal decoherence which is found to suppress Anderson localization. We also address quantum transport in chains with particle losses which are of considerable interest for laboratory experiments with cold atoms.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
International Research Center of Spectroscopy and Quantum Chemistry – IRC SQC, Siberian Federal University, 660041 Krasnoyarsk, Russia

Доп.точки доступа:
Коловский, Андрей Радиевич
}
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17.

Raman study of decomposition of Na-bearing carbonates in water fluid at high P–T parameters / S. Goryainov, A. Krylov, U. Borodina [et al.] // Spectrochim. Acta - A: Mol. Biomol. Spectrosc. - 2024. - Vol. 322. - Ст. 124801, DOI 10.1016/j.saa.2024.124801. - Cited References: 74. - Authors thank V.S. Shevchenko, A.F. Shatskiy, A.G. Sokol and A.V. Golovin for fruitful discussion. We acknowledge I.N. Kupriyanov for discussion and measurements of FTIR spectra of the samples. This work was carried out within the framework of the Russian Federation state assignment of the Sobolev Institute of Geology and Mineralogy SB RAS (state registration number: 122041400176-0) and A.K., S.K and A.V. thanks for support the Russian Federation state assignment of Kirensky Institute of Physics, Federal Research Center KSC SB RAS (state registration number: FWES-2024-0003). Work partially supported by the Russian Foundation for Basic Researches (RFBR-21-55-14001 ANF a grant). Equipment and devices of the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” were used for Raman experiments at high P–T conditions . - ISSN 1386-1425. - ISSN 1873-3557
Кл.слова (ненормированные):
Raman spectroscopy -- Carbonates -- High pressure -- High temperature -- Abiogenic formation of organics -- Organic formates -- Organic molecular crystals
Аннотация: The study of Na-carbonates stability and their transformations in aqueous carbonate fluid under high P–T conditions is relevant from the point of view of the understanding geochemical processes of the Na-assisted carbon circulation in the Earth’s crust and subduction zones. In situ Raman study of Na-bearing carbonate-water-Fe-metal system in diamond anvil cell (DAC) at high P–T conditions revealed that carbonates decompose with abiogenic formation of formates and other organic compounds that differs from behavior of carbonates in dry system. XRD and FTIR methods have been used additionaly to determine the phase composition. Na-bearing carbonates (nahcolite NaHCO3, shortite Na2Ca2(CO3)3 and cancrinite Na7Ca[(CO3)1.5Al6Si6O24]·2H2O) in aqueous fluid decompose to form simple carbonates and formates (as dominant organic molecules) at moderate P–T parameters (above ∼0.2 GPa, 200°C). Our experimental results directly confirm the hypothesis of Horita and Berndt (Science, 1999) about possible yield of organic formates in the carbonate-water-metal system. Nahcolite NaHCO3 in aqueous fluid in the presence of Fe metal decomposes into anhydrous phases: natrite γ-Na2CO3, siderite, magnetite (due to dissolution of Fe steel gasket), Na-formate and likely organic molecular crystalline solvate of Na-formate and methyl formate. Shortite decays into anhydrous phases: aragonite CaCO3, Na-Ca-formates and an amorphous phase. Cancrinite decomposes to unidentified carbonate-alumonosilicate phases, Na-Ca-formates and unknown organic molecular crystal. Magnetite is also formed in this system due to dissolution of Fe steel gasket used in DAC. The present study provides a new insight in processes of abiogenic formation of organic matter from carbonates in the crust and upper mantle.

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Держатели документа:
Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, prospect Acad. Koptyug 3, Novosibirsk, 630090, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok, 50, bld. 38, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Goryainov, S.; Krylov, A. S.; Крылов, Александр Сергеевич; Borodina, U.; Likhacheva, A.; Krylova, S. N.; Крылова, Светлана Николаевна; Seryotkin, Yu.; Bogdanov, N.; Vtyurin, A. N.; Втюрин, Александр Николаевич; Grishina, S.
}
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18.

Structural, electronic, and optical properties of ferroelectric hybrid (Me2NH2)[NaFe(CN)5(NO)] crystal: Density functional theory simulation / S. Krylova, W. -J. Xu, J. Rocha, A. Kholkin // Mater. Today Commun. - 2024. - Vol. 40. - Ст. 109623, DOI 10.1016/j.mtcomm.2024.109623. - Cited References: 50. - This work was developed within the scope of the project CICECOAveiro Institute of Materials, UIDB/50011/2020 (DOI 10.54499/UIDB/50011/2020), UIDP/50011/2020 (DOI 10.54499/UIDP/50011/2020) and LA/P/0006/2020 (DOI 10.54499/LA/P/0006/2020), financed by national funds through the FCT/MCTES (PIDDAC). W-JX, JR, and AK were supported by the Fundação para a Ciência e a Tecnologia (FCT) through the project ‘‘PhotoMultiFerro’’ (PTDC/CTM-CTM/4044). SK acknowledges the support by the state assignment of the Kirensky Institute of Physics FRC KSC SB RAS. We would like to express our gratitude to Prof. Pierre Cazade for the valuable insights and constructive discussions he has provided . - ISSN 2352-4928
Кл.слова (ненормированные):
Sodium nitroprusside -- Density functional theory -- Electronic properties -- Hybrid crystal
Аннотация: Utilizing density functional theory (DFT), we embarked on a comprehensive investigation of the structural, electronic, and optical properties characteristic of the ferroelectric hybrid (Me2NH2)[NaFe(CN)5(NO)] crystal. The geometry of the crystal structure in the Pna21 phase was optimized. We simulated the electronic band structure within the first Brillouin zone. The calculated band gap for the indirect U-X transition is 2.401 eV, indicative of a wide band gap semiconductors. We also simulated the density of electronic states across the Brillouin zone. The simulation of the electronic structure revealed that the crystal comprises both ionic and covalent bonds. We accurately predicted various optical parameters including the dielectric function, conductivity, reflectivity, loss function, absorption, and refractive index. The reflectivity of the crystal does not exceed 21 percent. All calculated optical properties of the (Me2NH2)[NaFe(CN)5(NO)] crystal are anisotropic.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
Department of Chemistry & CICECO – Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal
Department of Physics & CICECO – Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro, Portugal

Доп.точки доступа:
Krylova, S. N.; Крылова, Светлана Николаевна; Xu, W.-J.; Rocha, J.; Kholkin, A.
}
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19.

Martynov, S. N.
Anisotropic exchange interactions in a ferromagnet PbMnBO4 / S. N. Martynov // JETP Lett. - 2024. - Vol. 119, Is. 11. - P. 879-884, DOI 10.1134/S0021364024600812. - Cited References: 43. - I am grateful to A.I. Pankrats, V.I. Zinenko, and S.N. Krylova for useful discussions . - ISSN 0021-3640. - ISSN 1090-6487
Аннотация: The field dependence of the magnetization along the hard axes in a four-sublattice ferromagnet PbMnBO4 is calculated by the numerical minimization of the ground state energy in the approximation of classical magnetic moments. The parameters of anisotropic interactions—the second-order single-ion anisotropy constants, the magnitude and direction of the antisymmetric exchange vector, and the symmetric anisotropic exchange tensor—are obtained by a comparison with experimental magnetization curves. The direction of the Dzyaloshinskii–Moriya interaction vector is close to the orthorhombic c axis. The symmetric exchange tensor has an almost uniaxial form with the easy axis perpendicular to the antisymmetric exchange vector. Changes in the energy of each anisotropic interaction during magnetization reorientation are calculated.

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Публикация на русском языке Мартынов, Сергей Николаевич. Анизотропные обменные взаимодействия в ферромагнетике PbMnBO4 [Текст] / С. Н. Мартынов. - 7 с. // Письма в ЖЭТФ. - 2024. - Т. 119 Вып. 11. - С. 847-853

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, Russian Academy of Sciences, 660036, Akademgorodok, Krasnoyarsk, Russia

Доп.точки доступа:
Мартынов, Сергей Николаевич
}
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20.

Altunin, R. R.
Kinetics of diffusion and phase formation in a solid-state reaction in Al/Au thin films / R. R. Altunin, E. T. Moiseenko, S. M. Zharkov // J. Alloys Compd. - 2024. - Vol. 1002. - Ст. 175500, DOI 10.1016/j.jallcom.2024.175500. - Cited References: 83. - This work was supported by the Russian Science Foundation (grant # 22-13-00313) . - ISSN 0925-8388. - ISSN 1873-4669
Кл.слова (ненормированные):
Thin films -- Solid-state reaction -- Al-Au intermetallic compounds -- In situ electron diffraction -- Phase transformation -- Kinetics
Аннотация: The kinetics of diffusion and formation of Al-Au intermetallic compounds in a solid-state reaction between layers of aluminum and gold has been studied by the method of in situ electron diffraction. The phase sequence in the solid-state reaction in Al/Au thin films is found to depend on the atomic ratio of aluminum and gold at the initial state. Specifically, with the atomic ratio being Al:Au=2:1, one observes the formation sequence: Al3Au8→AlAu2→Al2Au, while with the ratio Al:Au=1:4, the sequence is Al3Au8→AlAu4. The observed change in the sequence is explained using the theoretical model of EHF (Effective Heat of Formation). The kinetic parameters of the diffusion of gold through the layer of reaction products in the Al/Au thin films have been determined, including the apparent activation energy of the diffusion Ea=1.17 eV and pre-exponential factor D0=120 cm2/s. Based on the data obtained by in situ electron diffraction, the kinetic parameters of the phase formation have been estimated by the Kissinger-Akahira-Sunose method. In addition, the kinetic parameters of the formation of the Al-Au intermetallic compounds have been determined (apparent activation energy Ea, pre-exponential factor A) in the solid-state reaction in the Al/Au thin films, namely, Ea = 0.77 eV, log(A, s−1) = 9 for Al3Au8; Ea = 1.08 eV, log(A, s−1) = 13 for AlAu2; Ea = 1.13 eV, log(A, s−1) = 13 for Al2Au; and Ea = 1.35 eV, log(A, s−1) = 16 for the phase AlAu4. The kinetic parameters of the formation of the AlAu4 phase have been estimated for the first time.

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Держатели документа:
Siberian Federal University, 79 Svobodny pr., Krasnoyarsk 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Moiseenko, E. T.; Zharkov, S. M.; Жарков, Сергей Михайлович
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