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Realizing persistent zero area compressibility over a wide pressure range in Cu2GeO4 by microscopic orthogonal-braiding strategy / X. Zhang, Yo. Liu, M. S. Molokeev [et al.] // Angew. Chem. - 2024. - Vol. 136, Is. 7. - Ст. e202318401, DOI 10.1002/ange.202318401. - Cited References: 24. - The authors would like to acknowledge Zhuohong Yin for useful discussions and experimental time for the 4W2 beamline in the Beijing synchrotron radiation facility (BSRF). This work was supported by the National Scientific Foundations of China (Grants T2222017, 12274425, 22133004, 11974360 and 51890864) and the CAS Project for Young Scientists in Basic Research (YSBR-024). M.S. Molokeev would like to acknowledge support fromthe Ministry of Science and High Education of the Russian Federation (Project No. FSRZ-2023-0006) . - ISSN 0044-8249. - ISSN 1521-3757
Кл.слова (ненормированные):
Zero area compressibility -- Orthogonal-Braiding -- High pressure -- Copper-based oxides -- First-principles calculation
Аннотация: Zero area compressibility (ZAC) is an extremely rare mechanical response that exhibits an invariant two-dimensional size under hydrostatic pressure. All known ZAC materials are constructed from units in two dimensions as a whole. Here, we propose another strategy to obtain the ZAC by microscopically orthogonal-braiding one-dimensional zero compressibility strips. Accordingly, ZAC is identified in a copper-based compound with a planar [CuO4] unit, Cu2GeO4, that possesses an area compressibility as low as 1.58(26) TPa-1 over a wide pressure range from ≈0 GPa to 21.22 GPa. Based on our structural analysis, the subtle counterbalance between the shrinkage of [CuO4] and the expansion effect from the increase in the [CuO4]-[CuO4] dihedral angle attributes to the ZAC response. High-pressure Raman spectroscopy, in combination with first-principles calculations, shows that the electron transfer from in-plane bonding dx2-y2 to out-of-plane nonbonding dz2 orbitals within copper atoms causes the counterintuitive extension of the [CuO4]-[CuO4] dihedral angle under pressure. Our study provides an understanding on the pressure-induced structural evolution of copper-based oxides at an electronic level and facilitates a new avenue for the exploration of high-dimensional anomalous mechanical materials.

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Держатели документа:
Functional Crystals Lab, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
University of the Chinese Academy of Sciences, Beijing 100049, China
Department of Physics, Far Eastern State Transport University, Khabarovsk 680021, Russia
International Research Center of Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Zhang, Xingyu; Liu, Youquan; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xu, Bohui; Jiang, Xingxing; Lin, Zheshuai
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    Realizing persistent zero area compressibility over a wide pressure range in Cu2GeO4 by microscopic orthogonal-braiding strategy / X. Zhang, Yo. Liu, M. S. Molokeev [et al.] // Angew. Chem. Int. Ed. - 2024. - Vol. 63, Is. 7. - Ст. e202318401, DOI 10.1002/anie.202318401. - Cited References: 24. - The authors would like to acknowledge Zhuohong Yin for useful discussions and experimental time for the 4W2 beamline in the Beijing synchrotron radiation facility (BSRF). This work was supported by the National Scientific Foundations of China (Grants T2222017, 12274425, 22133004, 11974360 and 51890864) and the CAS Project for Young Scientists in Basic Research (YSBR-024). M.S. Molokeev would like to acknowledge support fromthe Ministry of Science and High Education of the Russian Federation (Project No. FSRZ-2023-0006) . - ISSN 1433-7851. - ISSN 1521-3773
   Перевод заглавия: Реализация постоянной нулевой сжимаемости в широком диапазоне давлений в Cu2GeO4 с помощью микроскопической стратегии ортогонального плетения
Кл.слова (ненормированные):
Zero area compressibility -- Orthogonal-Braiding -- High pressure -- Copper-based oxides -- First-principles calculation
Аннотация: Zero area compressibility (ZAC) is an extremely rare mechanical response that exhibits an invariant two-dimensional size under hydrostatic pressure. All known ZAC materials are constructed from units in two dimensions as a whole. Here, we propose another strategy to obtain the ZAC by microscopically orthogonal-braiding one-dimensional zero compressibility strips. Accordingly, ZAC is identified in a copper-based compound with a planar [CuO4] unit, Cu2GeO4, that possesses an area compressibility as low as 1.58(26) TPa-1 over a wide pressure range from ~0 GPa to 21.22 GPa. Based on our structural analysis, the subtle counterbalance between the shrinkage of [CuO4] and the expansion effect from the increase in the [CuO4]-[CuO4] dihedral angle attributes to the ZAC response. High-pressure Raman spectroscopy, in combination with first-principles calculations, shows that the electron transfer from in-plane bonding dx2-y2 to out-of-plane nonbonding dz2 orbitals within copper atoms causes the counterintuitive extension of the [CuO4]-[CuO4] dihedral angle under pressure. Our study provides an understanding on the pressure-induced structural evolution of copper-based oxides at an electronic level and facilitates a new avenue for the exploration of high-dimensional anomalous mechanical materials.

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Держатели документа:
Functional Crystals Lab, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
University of the Chinese Academy of Sciences, Beijing 100049, China
Department of Physics, Far Eastern State Transport University, Khabarovsk 680021, Russia
International Research Center of Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Zhang, Xingyu; Liu, Youquan; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xu, Bohui; Jiang, Xingxing; Lin, Zheshuai
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Crystal structure and thermoelectric properties of mechanically activated LaCoO3 / V. A. Dudnikov, Yu. S. Orlov, L. A. Solovyov [et al.] // J. Taiwan Inst. Chem. Eng. - 2024. - Vol. 162. - Ст. 105560, DOI 10.1016/j.jtice.2024.105560. - Cited References: 88. - This study was supported by the Russian Science Foundation , project no. 24-22-00091 . - ISSN 1876-1070. - ISSN 1876-1089
Кл.слова (ненормированные):
Rare-earth cobalt oxides -- Crystal structure -- Thermoelectric properties -- Mechanical activation
Аннотация: Background: Crystal structure of rare-earth LaCoO3 cobalt oxide subjected to high energy mechanical activation has been studied. In the temperature range of 300–800 K, the electrical conductivity and Seebeck coefficient were measured. Thermal conductivity was measured at 300–480 K. Methods: Comparative analysis of thermoelectric properties of the samples prepared by standard solid-state reaction and using high-energy mechanical activation was carried out. Findings: It was found that the experimental X-ray diffraction patterns are best described within the model that allows the coexistence of two domains in samples with the same crystal symmetry, but different lattice a and c parameters. The percentage ratio of these domains in the samples depends significantly on the size of the initial particles in the solid-state synthesis reaction and the annealing temperature. Mechanical activation and increase of synthesis temperature result in change of Seebeck coefficient sign and significant decrease of electrical resistivity. The Seebeck coefficient of non-activated samples takes positive values over the entire temperature range and decreases monotonically with increasing temperature, in contrast to mechanically activated samples exhibiting ambipolar behavior.

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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
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Solovyov, L. A.; Vereshchagin, S. N.; Ustyuzhanin, Yu. N.; Устюжанин, Юрий Николаевич; Zharkov, S. M.; Жарков, Сергей Михайлович; Zeer, G. M.; Borus, A. A.; Борус, Андрей Андреевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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Features of the melt–solution synthesis of the TbCr3(BO3)4 single crystals / I. A. Gudim, N. V. Mikhashenok, A. D. Vasiliev [et al.] // J. Cryst. Growth. - 2024. - Vol. 637-638. - Ст. 127716, DOI 10.1016/j.jcrysgro.2024.127716. - Cited References: 22. - The authors thank A.V. Zamkov for assistance in preparing the samples for the conoscopic study. The characterization and examination of the samples were performed at the Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences. - This study was supported in part by the Russian Science Foundation and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activity, project no. 22-12-20019 . - ISSN 0022-0248. - ISSN 1873-5002
Кл.слова (ненормированные):
Growth from melt-solution -- Single crystal growth -- Cromium borates -- Rare-earth compounds -- Oxides -- Magnetic materials
Аннотация: The phase formation of terbium chromoborate TbCr3(BO3)4 in the bismuth trimolybdate and lithium tungstate melt–solutions has been studied. The absence of the terbium chromoborate trigonal phase in the bismuth trimolybdate-based system at all component ratios has been shown. The component ratio in the lithium tungstate-based system has been found at which the TbCr3(BO3)4 trigonal crystals are formed at temperatures above 1100 °C; below this temperature, the monoclinic phase dominates. The structural and magnetic properties of the grown crystals have been studied. It has been established that the trigonal and monoclinic TbCr3(BO3)4 crystals synthesized from the lithium tungstate-based solvent exhibit identical magnetic properties. At the same time, a significant difference of the magnetic properties of the single crystals synthesized from the bismuth molybdate melt–solution has been observed. This difference has been attributed to the effect of Bi3+ ions that partially replace Tb3+ ions.

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

Доп.точки доступа:
Gudim, I. A.; Гудим, Ирина Анатольевна; Mikhashenok, N. V.; Михашенок, Наталья Владимировна; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Melnikova, S. V.; Мельникова, Светлана Владимировна; Pavlovskii, M. S.; Павловский, Максим Сергеевич; Skorobogatov, S. A.; Скоробогатов, Станислав Алексеевич; Pankrats, A. I.; Панкрац, Анатолий Иванович
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Influence of Ga-substitution to the structural and magnetic properties of (Mn,Fe)2O3 bixbyite / E. M. Moshkina, M. S. Molokeev, E. V. Eremin, L. N. Bezmaternykh // Phys. Solid State. - 2023. - Vol. 65, Is. 6. - P. 1009-1014, DOI 10.21883/PSS.2023.06.56116.57. - Cited References: 17. - This study was supported by grant № 21-72-00130, provided by the Russian Science Foundation (https://rscf.ru/project/21-72-00130/.) . - ISSN 1063-7834. - ISSN 1090-6460
Кл.слова (ненормированные):
transition metal oxides -- magnetic phase transitions -- spin glass state -- bixbyite
Аннотация: To study the dependence of the properties of ternary oxides (Mn,Fe,Ga)2O3 with the bixbyite structure on the composition, the temperature dependences of the magnetization and ac magnetic susceptibility of two single-crystal samples of different compositions obtained using the flux method were analyzed. A detailed study of the structure was carried out using single-crystal X-ray diffraction analysis, and the changes in structural parameters depending on the composition were analyzed. The dc magnetization and ac magnetic susceptibility of Fe1.1Mn0.76Ga0.14O3 and Fe0.65Mn1.1Ga0.26O3 bixbyites have been studied. Despite the qualitatively similar behavior of the magnetic properties, significant differences were also found, despite a small difference in the Mn/Fe/Ga ratio in the samples under study. It is shown that both compounds experience two successive low-temperature magnetic phase transitions from the paramagnetic phase at T = 20 – 32 K as the temperature is lowered. Calculations of the Mydosh parameter for the detected phase transitions showed different degrees of ordering in the compounds under study.

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Публикация на русском языке Влияние Ga-замещения на структурные и магнитные свойства биксбиита (Mn,Fe)2O3 [Текст] / Е. М. Мошкина, М. С. Молокеев, Е. В. Еремин, Л. Н. Безматерных. - 6 с. // Физ. твердого тела. - 2023. - Т. 65 Вып. 6. - С. 1054-1059

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Siberian Federal University, Krasnoyarsk, Russia
Far Eastern State Transport University, Khabarovsk, Russia
Siberian State University of Science and Technology, Krasnoyarsk, Russia

Доп.точки доступа:
Moshkina, E. M.; Мошкина, Евгения Михайловна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Eremin, E. V.; Еремин, Евгений Владимирович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Nanophysics and Nanoelectronics, International Symposium(27 ; 13-16 March 2023 ; Nizhny Novgorod, Russia)
}
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Features of spin crossovers in magnetic materials / Yu. S. Orlov, S. V. Nikolaev, V. A. Dudnikov [et al.] // Phys. Usp. - 2023. - Vol. 66, Is. 7. - P. 647-672, DOI 10.3367/UFNe.2022.05.039195. - Cited References: 237. - The authors thank the Russian Science Foundation for financial support in the framework of project no. 18-12-00022 . - ISSN 1063-7869. - ISSN 1468-4780
Кл.слова (ненормированные):
spin crossovers -- exchange interaction -- Bose condensationl -- spin excitons -- transition metal oxides -- rare earth cobaltites -- strong electron correlations -- antiferromagnetism -- ferromagnetism -- metal–insulator transition -- Earth's mantle -- Hubbard model
Аннотация: We present experimental and theoetical results of spin crossover studies in magnetically ordered materials. The effect of spin crossovers on the electronic structure of transition metal oxides and on the Bose condensation of spin excitons in the vicinity of the spin crossover is considered. A new method for calculating the interatomic superexchange interaction in transition metal oxides is discussed that allows considering selective contributions of excited magnetic cation terms. Changes in the exchange interaction sign are predicted for spin crossovers for d5—d7 ions. In the RCoO3 family of rare-earth cobaltites, the ground state is nonmagnetic, but, as the temperature increases, thermal excitations of high-spin states give rise to a number of experimentally detectable features. In defective RCoO3 samples, stabilization of the high-spin term and ferromagnetic ordering are possible. Dynamical crossovers under external pumping and the dynamics of multiplicity, magnetization, and local lattice distortions are discussed. Geophysical implications of spin crossovers are considered, and metallic properties of Earth's mantle at a depth of 1400—1800 km are predicted.

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Публикация на русском языке Особенности спиновых кроссоверов в магнитных материалах [Текст] / Ю. С. Орлов, С. В. Николаев, В. А. Дудников [и др.] // Успехи физ. наук. - 2023. - Т. 193 № 7. - С. 689–716

Держатели документа:
Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences, Academgorodok 50, str. 38, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Nikolaev, S. V.; Николаев, Сергей Викторович; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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    Особенности формирования перовскитоподобных фаз Раддлесдена — Поппера на основе редкоземельных оксидов / С. Н. Верещагин, В. А. Дудников, Е. В. Рабчевский, Л. А. Соловьев // Труды Кольского научн. центра РАН. Сер. технич. науки. - 2023. - Vol. 14, Is. 3. - С. 76-81 ; Trans. Kola Sci. Centre RAS. Ser. Eng. Sci., DOI 10.37614/2949-1215.2023.14.3.013. - Библиогр.: 14. - Статья выполнена при поддержке федерального бюджета по теме государственного задания Института химии и химической технологии ФИЦ КНЦ СО РАН № 0287-2021-00-13 с использованием оборудования Красноярского регионального центра коллективного пользования ФИЦ КНЦ СО РАН . - ISSN 2949-1215
   Перевод заглавия: Peculiarities of formation of perovskite-like Ruddlesden – Popper phases based on rare-earth oxides
Кл.слова (ненормированные):
фазы Раддлесдена — Поппера -- перовскит -- кобальтит -- оксиды редкоземельных элементов -- Ruddlesden — Popper phases -- perovskite -- cobaltite -- rare earth oxides
Аннотация: В работе с использованием доступных в литературе термодинамических данных исследована зависимость величины ∆G0n,f (стандартной свободной энергии Гиббса образования фаз Раддлесдена — Поппера RPn) от значения параметра n в ряду AO∙(ABO3)n, где A = Са, Sr, Ba, La; B = Co, Ni, Ti, Zr, Hf. Обнаружено, что величина ∆G01/n,f фаз RPn для всех изученных систем линейно зависит от 1/n. Проанализированы следствия существования линейной зависимости с позиций проведения синтеза фаз RPn. На примере стронцийредкоземельных кобальтитов состава (SrxLn1-x)n+1СоnO3n+1 (Ln = Sm, Gd, Dy; n = 2, ∞) продемонстрирована возможность получения фаз RPn с различным характером распределения катионов Sr/Ln по А-позициям кристаллической решетки, приведены условия стабилизации новых метастабильных фаз (SrxLn1-x)3Со2O7-δ, отсутствующих на фазовых диаграммах.
The dependence of the value of ∆G0n,f (the standard Gibbs free energy of Ruddlesden-Popper RPn phase formation) on the n-value in the series AO∙(ABO3)n (where A = Ca, Sr, Ba, La; B = Co, Ni, Ti, Zr, Hf) was analyzed using the thermodynamic data available in the literature. It is found that the value of ∆G01/n,f for all analyzed systems depends linearly on 1/n. The consequences of the existence of the linear dependence are analyzed from the point of view of carrying out the synthesis of the RPn phases. On the example of strontium-rare-earth cobaltites of the composition (SrxLn1-x)n+1СоnO3n+1 (Ln = Sm, Gd, Dy; n = 2, ∞), the possibility of obtaining RPn phases with a different character of the distribution of Sr/Ln cations over the A-positions of the crystalline lattice, stabilization conditions for new metastable phases (SrxLn1-x)3Со2O7-δ, which are absent in the phase diagrams in air, are given.

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Держатели документа:
Институт химии и химической технологии Федерального исследовательского центра «Красноярский научный центр Сибирского отделения Российской академии наук» (ФИЦ КНЦ СО РАН), г. Красноярск, Россия
Институт физики им. Л.В. Киренского ФИЦ КНЦ СО РАН, г. Красноярск, Россия

Доп.точки доступа:
Верещагин, Сергей Николаевич; Дудников, Вячеслав Анатольевич; Dudnikov, V. A.; Рабчевский, Евгений Владимирович; Соловьев, Леонид Александрович

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Flux growth and phase diversity of the triple oxides of transition metals (Mn,Fe,Ga)2O3 in multicomponent fluxes based on Bi2O3–MoO3–B2O3–Na2O / E. Moshkina, Yu. Seryotkin, O. Bayukov [et al.] // CrystEngComm. - 2023. - Vol. 25, Is. 18. - P. 2824-2834, DOI 10.1039/D3CE00147D. - Cited References: 38. - The study was supported by the Russian Science Foundation (grant no. 21-72-00130) . - ISSN 1466-8033
Аннотация: To determine the mutual influence of the solvent and soluble in multicomponent fluxes based on Bi2O3–MoO3–B2O3–Na2O, the crystallization of the triple oxides of the transition metals (Mn,Fe,Ga)2O3 is investigated, namely the phases based on orthorhombic FeGaO3 and bixbyite FeMnO3. Simultaneously, a set of fluxes is studied based on the variation in the component ratio with regard to the solvent and soluble. The crucial role of various components of the flux system is considered at the intersection of the phase boundaries. Fluxes for the stable growth of (Mn,Fe,Ga)2O3 single crystals of the studied phases (based on orthorhombic FeGaO3 and bixbyite FeMnO3) are determined. A set of single crystal samples (9 samples) with different Fe/Mn/Ga ratios is obtained. The actual composition of the samples is studied using the EDX technique. The partition coefficients of Fe2O3, Mn2O3 and Ga2O3 in the studied fluxes are analyzed. The structure of the obtained samples is characterized using X-ray diffraction methods, including the phase composition, space group and lattice parameters. The room temperature Raman spectra of the obtained samples are presented. The distribution of iron cations over the crystal positions in the obtained phases is studied using Mossbauer spectroscopy.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Novosibirsk State University, 630090 Novosibirsk, Russia
Institute of Geology and Mineralogy, 630090 Novosibirsk, Russia
Siberian Federal University, 660041 Krasnoyarsk, Russia
Far Eastern State Transport University, 680021 Khabarovsk, Russia
Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”, 660036 Krasnoyarsk, Russia
Siberian State University of Science and Technologies, 660037 Krasnoyarsk, Russia

Доп.точки доступа:
Moshkina, E. M.; Мошкина, Евгения Михайловна; Seryotkin, Yurii; Bayukov, O. A.; Баюков, Олег Артемьевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Kokh, Dieter; Smorodina, Ekaterina; Krylov, A. S.; Крылов, Александр Сергеевич; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
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Synthesizing antiferromagnetic α-Fe2O3–rGO discs: Their magnetic and magneto-optical properties / A. V. Kurilova, A. E. Sokolov, A. L. Sukhachev [et al.] // Bull. Russ. Acad. Sci. Phys. - 2022. - Vol. 86, Is. 5. - P. 610-613, DOI 10.3103/S106287382205015X. - Cited References: 26 . - ISSN 1062-8738
Кл.слова (ненормированные):
Hematite -- Optical properties -- Antiferromagnetics -- Graphene layers -- Hematite nanoparticles -- Hybrid structure -- Magnetic and magneto-optical properties -- Reduced graphene oxides -- Uniform distribution
Аннотация: A comprehensive study is performed of the properties of hybrid structures of iron oxide and reduced graphene oxide α-Fe2O3/rGO synthesized via “wet mixing.” It is shown that hematite nanoparticles with a comparatively uniform distribution can be encapsulated in graphene layers, and the way of preparing precursors is of critical importance in shaping the magneto-optical properties of α-Fe2O3/rGO hybrid structures.

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Публикация на русском языке Синтез, магнитные и магнитооптические свойства антиферромагнитных нанодисков α-Fe2O3–rGO [Текст] / А. В. Курилова, А. Э. Соколов, А. Л. Сухачев [и др.] // Изв. РАН. Сер. физич. - 2022. - Т. 86 № 5. - С. 726-729

Держатели документа:
ITMO National Research University, St. Petersburg, 197101, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Kurilova, A. V.; Sokolov, A. Е.; Соколов, Алексей Эдуардович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Ivanova, O. S.; Иванова, Оксана Станиславовна; Bogdanov, K. V.; Baranov, M. A.; Dubavik, A. Y.
}
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10.

Samoshkina, Yu. E.
Low-hydrogenated ZnCoAlO films: structure, magneto-optical and magnetic behavior / Y. E. Samoshkina, D. A. Petrov, H. Chou // Appl. Phys. A. - 2022. - Vol. 128, Is. 6. - Ст. 519, DOI 10.1007/s00339-022-05665-z. - Cited References: 16. - This research was funded by the Russian Science Foundation Grant No. 21-72-00061 . - ISSN 0947-8396
Кл.слова (ненормированные):
Diluted oxides -- Polycrystalline thin films -- Hydrogenation -- Magnetic circular dichroism
Аннотация: Morphology, chemical composition, crystal structure, and magnetic circular dichroism of ZnO films doped simultaneously with Co and Al (CAZO) have been studied. The films were deposited on glass substrates by the RF magnetron sputtering of the Zn0.93Co0.05Al0.02O target. Low hydrogen concentrations of 1–4% were used in mixed Ar + H2 atmosphere together with high enough substrate temperature of 450 °C. A tendency to a decrease in the Zn amount and an increase in the relative Co and Al content in the films has been revealed in the presence of hydrogen in the atmosphere. The structural data of the studied films correlate well with those for high-hydrogenated (20–50% H2) CAZO films deposited under the same conditions and studied earlier. The new data indicate the prospect of obtaining ferromagnetic samples based on ZnO without any secondary phases.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424, Taiwan
Department of Applied Physics, National University of Kaohsiung, Kaohsiung, 81148, Taiwan

Доп.точки доступа:
Petrov, D. A.; Петров, Дмитрий Анатольевич; Chou, H.; Самошкина, Юлия Эрнестовна
}
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11.

Zhandun, V. S.
The spin-state transition in ACo2O4 spinels (A = Be, Mg, Ca, Cd, Zn) / V. S. Zhandun, O. N. Draganyuk // J. Magn. Magn. Mater. - 2022. - Vol. 552. - Ст. 169206, DOI 10.1016/j.jmmm.2022.169206. - Cited References: 51. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research projects № 19-42-240016: «Control of structural, magnetic, electronic, and optical properties by pressure and intercalation into functional compounds with a spinel structure containing 3d and 4f ions» and № 20-42-240004: “The effect of the composition, pressure, and dimension on the magnetic, electronic, optical, and elastic properties of the magnetic Mn+1AXn (M = Cr, Mn; Fe, A = Al, Ga, Si, Ge, P, In; X = C, N; n = 1-3) MAX-phases”. The calculations were performed with the computer resources of “Complex modeling and data processing research installations of mega-class” SRC “Kurchatovsky Institute” (http://ckp.urcki.ru) . - ISSN 0304-8853
Кл.слова (ненормированные):
Ab initio calculations -- Spinels -- Cobalt ion -- Oxides -- Spin-state transition -- Thin films -- Pressure
Аннотация: The magnetic and electronic properties of the Co-based spinel oxides ACo2O4 (A = Be, Mg, Ca, Zn, Cd) were studied within GGA + U approach. It was found that the Co3+ ion is in a low-spin state due to the effect of the crystal field of octahedral symmetry. It is shown that Co3+ ion undergoes a spin-state transition into the high-spin state under the critical pressure of P = −10 GPa – −20 GPa. This pressure-induced spin-state transition is caused by the redistribution of electrons between the t2g- and eg-orbitals arising with increasing interatomic distances. The role of interatomic distances between Co3+ ion and its ligands is discussed. Thin-film form also favors the appearance of a high-spin state of Co3+ ion. At the same critical pressure, there is a sharp increase in the majority spin bandgap and a sharp decrease in the minority spin bandgap. These findings allow manipulating the spin state of Co3+ ions and bandgap width through the pressure or strain arising in thin films.

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Kirensky Institute of Physics - Federal Research Center “Krasnoyarsk Science Centre, Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Draganyuk, O. N.; Драганюк, Оксана Николаевна; Жандун, Вячеслав Сергеевич
}
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12.

Быков, Алексей Анатольевич.
Сверхпроводимость на границе несверхпроводящих La2CuO4 и La1.56Sr0.44CuO4 / А. А. Быков, К. Ю. Терентьев, Д. М. Гохфельд // Международный семинар "Фазовые переходы и неоднородные состояния в оксидах" : программа и сборник тезисов. - Казань, 2022. - С. 72. - Библиогр.: 4

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Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Терентьев, Константин Юрьевич; Terent'yev, K. Yu.; Гохфельд, Денис Михайлович; Gokhfeld, D. M.; International Workshop on Phase Transitions and Inhomogeneous States in Oxides(2022 ; july ; 4-8 ; Kazan); "Фазовые переходы и неоднородные состояния в оксидах", международный семинар(2022 ; июль ; 4-8 ; Казань); Казанский физико-технический институт им. Е. К. Завойского Казанского научного центра РАН; Казанский (Приволжский) федеральный университет
}
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13.

    Magnetic and resonance properties of a low-dimensional cobalt–aluminum oxide–germanium film tunnel junction deposited by magnetron sputtering / A. V. Kobyakov, G. S. Patrin, V. I. Yushkov [et al.] // Magnetochemistry. - 2022. - Vol. 8, Is. 10. - Ст. 130, DOI 10.3390/magnetochemistry8100130. - Cited References: 34. - The work was carried out in the process of fulfilling the state assignment of the Ministry of Science and Higher Education of the Russian Federation № FSRZ—2020—0011 “Synthesis and physical basis of nanoscale film and granular composite materials for spintronics devices” . - ISSN 2312-7481
   Перевод заглавия: Магнитно-резонансные свойства низкоразмерного пленочного туннельного перехода кобальт-оксид алюминия-германия, осажденного методом магнетронного распыления
Кл.слова (ненормированные):
ferromagnetic film -- anisotropy tunnel contact -- aluminum oxides
Аннотация: The temperature behavior of saturation magnetization and the temperature behavior of the integral signal intensity in electron magnetic resonance spectra is experimentally studied comprehensively using a low-dimensional Al2O3/Ge/Al2O3/Co (aluminum oxide–cobalt–aluminum oxide–germanium) tunnel junction with different deposition velocities of a ferromagnetic metal (Co) thin layer and non-magnetic layers (Al2O3/Ge/Al2O3). The cobalt ferromagnetic layer was deposited on aluminum oxide in two ways: in one cycle of creating the structure and with atmospheric injection before deposition of the cobalt layer. The thermomagnetic curves revealed the appearance of minima observed at low temperatures on both sides of the cobalt layer. Possible sources of precession perturbations at low temperatures can be explained by: the influence of the Al2O3 layer structure on the Al2O3/Co interface; residual gases in the working chamber atmosphere and finely dispersed cobalt pellets distributed over the cobalt film thickness. The work offers information of great significance in terms of practical application, for both fundamental physics and potential applications of ultrathin films.

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Держатели документа:
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, 660041, Russian Federation
Achinsk Branch of Krasnoyarsk State Agrarian University, Achinsk, 662155, Russian Federation

Доп.точки доступа:
Kobyakov, A. V.; Кобяков, Александр Васильевич; Patrin, G. S.; Патрин, Геннадий Семёнович; Yushkov, V. I.; Юшков, Василий Иванович; Shiyan, Ya. G.; Шиян, Ярослав Германович; Rudenko, R. Y.; Kosyrev, N. N.; Косырев, Николай Николаевич; Zharkov, S. M.; Жарков, Сергей Михайлович
}
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14.

Fluctuations of the multiplicity of Co3+ ions and softening of the phonon spectrum of rare-earth cobalt oxides / Y. S. Orlov, V. A. Dudnikov, A. E. Sokolov [et al.] // JETP Letters. - 2022. - Vol. 115, Is. 10. - P. 615-619, DOI 10.1134/S0021364022100575. - Cited References: 25. - This work was supported by the Russian Science Foundation (project no. 18-12-00022) . - ISSN 0021-3640
Аннотация: An unconventional temperature dependence of infrared absorption spectra of rare-earth cobalt oxides LaCoO3 and GdCoO3 has been studied experimentally and theoretically in the temperature range of 3.2–550 K. A quite strong softening of the optical phonon mode has been detected, which cannot be explained by standard lattice anharmonicity. It has been shown that the redshift of the phonon spectrum is due to the e-lectron–phonon coupling quadratic in the lattice displacement and to fluctuations of the multiplicity of Co3+ ions.

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Публикация на русском языке Флуктуации мультиплетности ионов Co3+ и смягчение фононного спектра редкоземельных оксидов кобальта [Текст] / Ю. С. Орлов, В. А. Дудников, А. Э. Соколов [и др.] // Письма в ЖЭТФ. - 2022. - Т. 115 Вып. 9-10. - С. 650-655

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Sukachev Institute of Forest, Federal Research Center KSC, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Sokolov, A. Е.; Соколов, Алексей Эдуардович; Ovchinnikova, T. M.; Shestakov, N. P.; Шестаков, Николай Петрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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15.

The Sr2.4Dy0.6Co2O7-δ Ruddlesden‒Popper Phase: Structural, thermoelectric, and magnetic properties / V. A. Dudnikov, Y. S. Orlov, L. A. Solovyov [et al.] // Ceram. Int. - 2021. - Vol. 47, Is. 7, Part A. - P. 9068-9074, DOI 10.1016/j.ceramint.2020.12.030. - Cited References: 39. - The study was supported by the Russian Foundation for Basic Research , project no. 19-03-00017 and the budget project #АААА-А17-117021310222-4 for the Institute of Chemistry and Chemical Technology, Siberian Branch of the Russian Academy of Sciences . - ISSN 0272-8842
Кл.слова (ненормированные):
Rare-earth substituted cobalt oxides -- Ruddlesden-Popper phase -- Thermoelectric oxide materials -- Magnetic properties
Аннотация: A new anion-deficient Sr2.4Dy0.6Co2O7‒δ (δ = 0.33–1.1) perovskite phase with a structure of the A3B2O7 Raddlesden‒Popper homologous series has been obtained by the solid-state synthesis in the reducing/oxidizing atmosphere and its structural characterization has been performed by the Rietveld refinement of the X-ray powder diffraction data. It has been stablished that the Sr2.4Dy0.6Co2O7‒δ compound (sp. gr. I4/mmm) has parameters of a = b = 3.8526(1) and c = 19.9431(7) Å in the reduced form (δ = 1.1) and a = b = 3.8086(1) and c = 19.9190(6) Å in the oxidized form (δ ≈ 0.33) and oxygen vacancies occupy mainly the sites linking CoO5 polyhedra inside two perovskite layers. It has been established using differential scanning calorimetry and thermogravimetry that, at T < 530 K, the synthesized phase is stable against the inert and oxidizing atmosphere; at higher temperatures, the Sr2.4Dy0.6Co2O7-δ compound can reversibly absorb/release oxygen. The magnetic properties of the Sr2.4Dy0.6Co2O6.09 compound have been investigated in the temperature range of 10–400 K and described in terms of the formation of dimers, in which the Co3+‒Co3+ and Co2+‒Co2+ ion pairs antiferromagnetically interact and are in the nonmagnetic ground state. The electrical conductivity and the Seebeck coefficient have been measured in air in the temperature range from 300 to 800 K. An observed sharp decrease in the Seebeck coefficient of the Sr2.4Dy0.6Co2O7-δ compound and the change in its sign near 700 K have been attributed to the transition of cobalt ions to the Co3+ state and the charge disproportionation of Co3+ ions to Co2+ and Co4+ ones.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Institute of Chemistry and Chemical Technology, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russian Federation

Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Solovyov, L. A.; Vereshchagin, S. N.; Gavrilkin, S. Y.
}
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16.

Structure and physical properties of hydrogenated (Co + Al)-doped ZnO films: Comparative study with co-doped ZnO films / Y. E. Samoshkina, I. S. Edelman, H. Chou [et al.] // Mater. Sci. Eng. B. - 2021. - Vol. 264. - Ст. 114943, DOI 10.1016/j.mseb.2020.114943. - Cited References: 52. - H.C. thanks the Ministry of Science and Technology of Taiwan for financial support [grant number MOST 108-2112-M-110-003]. The scanning electron microscopy investigations were conducted in the SFU Joint Scientific Center supported by Ministry of Science and Higher Education of the Russian Federation [state assignment number FSRZ-2020-0011]. X-ray diffraction data were obtained using analytical equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” . - ISSN 0921-5107
Кл.слова (ненормированные):
(Co + Al)-doped ZnO -- Co-doped ZnO -- Diluted oxides -- Thin films -- Hydrogenation -- Room temperature ferromagnetism
Аннотация: (Co + Al)-doped ZnO films have been synthesized by the RF magnetron sputtering. Films of this composition have first been obtained in mixed atmosphere of Ar + H2. High hydrogen concentration of 20–50% has been used together with high enough substrate temperature of 450 °C. The used technological conditions affected the morphology, chemical composition, optical, electric, and magnetic properties of the films to an even more than in the case of Co-doped ZnO films synthesized under the same conditions and studied earlier. The films exhibit ferromagnetic behavior at room temperature with much greater magnetization and magneto-optical activity compared to the Co-doped films. At the same time, the hydrogenated films show an increase in electric conductivity in comparison with samples synthesized in the atmosphere of Ar + O2. The magnetic nature of the hydrogenated films has been associated with the defect-related mechanism.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Department of Physics, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
Department of Applied Physics, National University of Kaohsiung, Kaohsiung, 81148, Taiwan
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Chou, H.; Lin, H. -C.; Dwivedi, G. D.; Petrov, D. A.; Петров, Дмитрий Анатольевич; Zharkov, S. M.; Жарков, Сергей Михайлович; Zeer, G. M.; Molokeev, M. S.; Молокеев, Максим Сергеевич
}
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17.

Zhandun, V. S.
Ab initio comparative study of the magnetic, electronic and optical properties of AB2O4 (A, B= Mn, Fe) spinels / V. S. Zhandun, A. V. Nemtsev // Mater. Chem. Phys. - 2021. - Vol. 259. - Ст. 124065, DOI 10.1016/j.matchemphys.2020.124065. - Cited References: 32. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project № 19-42-240016: «Control of structural, magnetic, electronic, and optical properties by pressure and intercalation into functional compounds with a spinel structure containing 3d and 4f ions » The calculations were performed with the computer resources of “Complex modeling and data processing research installations of mega-class” SRC “Kurchatovsky Institute” (http://ckp.urcki.ru) . - ISSN 0254-0584. - ISSN 1879-3312
Кл.слова (ненормированные):
Ab initio calculations -- Spinel -- Magnetic and electronic properties -- Optical properties -- Inverse structure -- Manganese and iron oxides
Аннотация: The comparison of the magnetic, electronic, and optical properties of the spinel transition-metal oxides AB2O4 (A, B = Fe, Mn) and their relationship with the structure and composition were studied within DFT-GGA + U approximation. The spinels were considered both in the normal and inverse structure. We have found that regardless of composition and structure, the studied spinels are ferrimagnetic with antiparallel magnetic moments on A- and B-site cations. Electronic and structural properties of spinels depend on the composition: FeMn2O4 has a tetragonal structure and half-metallic properties; however, in the inverse FeMn2O4, the bandgap opens for the spin-up channel. MnFe2O4 is a cubic insulator with a bandgap of about 1.5 eV, which decreases in the inverse structure. The superexchange constants estimate within the simple indirect coupling model and have values close to the experimental ones. The total magnetization of FeMn2O4 is drop-down to zero under hydrostatic pressure above 60 GPa due to the strong dependence of the magnetic moment of octahedral manganese ion on the pressure. The microscopic mechanisms of the relationship between the structure, composition and properties are studied.

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Kirensky Institute of Physics, Federal Research Center, Krasnoyarsk Science Centre, Siberian Branch of the Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Nemtsev, A. V.; Немцев, А. В.; Жандун, Вячеслав Сергеевич
}
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18.

Iron oxide nanoparticles for isolating DNA from blood cells / A. V. Tyumentseva, A. S. Gorbenko, R. N. Yaroslavtsev [et al.] // Bull. Russ. Acad. Sci. Phys. - 2021. - Vol. 85, Is. 9. - P. 965-969, DOI 10.3103/S1062873821090185. - Cited References: 13. - This work was supported by the Russian Foundation for Basic Research; the Government of Krasnoyarsk Territory; the Krasnoyarsk Regional Fund for the Support of Scientific and Scientific and Technical Activities, project no. 20-42-242902; and the RF Presidential Council of Grants for the State Support of Young Russian Scientists (Candidates of Science), project no. MK-1263.2020.3 . - ISSN 1062-8738
Кл.слова (ненормированные):
Blood -- Cells -- Cytology -- Iron oxides -- Metal nanoparticles -- Nanomagnetics -- Silicates -- Synthesis (chemical) -- Blood cells -- Cell-be -- Cell/B.E -- Cell/BE -- Leucocytes -- Magnetic iron-oxide nanoparticles -- Physical and chemical properties -- Silicate coatings -- Synthesised -- DNA
Аннотация: Magnetic iron oxide nanoparticles for separating DNA from blood cells are synthesized. Magnetic nanoparticles with a silicate coating are obtained, and their physical and chemical properties are studied. The possibility of using the nanocomposites to isolate DNA from leukocytes for hematological studies is confirmed experimentally.

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Публикация на русском языке Наночастицы оксидов железа для выделения ДНК из клеток крови [Текст] / А. В. Тюменцева, А. С. Горбенко, Р. Н. Ярославцев [и др.] // Изв. РАН. Сер. физич. - 2021. - Т. 85 № 9. - С. 1257-1262

Держатели документа:
Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Hematological Scientific Center, RF Ministry of Health and Social Development, Krasnoyarsk Branch, Krasnoyarsk, 660036, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Tyumentseva, A. V.; Gorbenko, A. S.; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Stolyar, S. V.; Столяр, Сергей Викторович; Gerasimova, Yu. V.; Герасимова, Юлия Валентиновна; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Bayukov, O. A.; Баюков, Олег Артемьевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Volochaev, M. N.; Волочаев, Михаил Николаевич; Olkhovskiy, I. A.; Iskhakov, R. S.; Исхаков, Рауф Садыкович
}
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19.

    Magneto-optics of hydrogenated ZnO, ZnO:Co, and ZnO:(Co+Al) films / Yu. E. Samoshkina, M. V. Rautskii, D. S. Neznakhin [et al.] // 2nd International workshop on advanced magnetic oxides (IWAMO-2021) : workshop book. - 2021. - P. 30. - Cited References: 4. - This research was funded by the Russian Science Foundation grant No. 21-72-00061
   Перевод заглавия: Магнитооптика гидрированных пленок ZnO, ZnO:Co и ZnO:(Co+Al)

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Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Petrov, D. A.; Петров, Дмитрий Анатольевич; Chou, H.; International Workshop on Advanced Magnetic Oxides(2 ; 2021 ; Nov. 24-26 November ; Aveiro, Portugal (online)); University of Aveiro; Institute of Nanostructures, Nanomodelling and Nanofabrication
}
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20.

Zhandun, V. S.
Electronic and magnetic properties of novel iron oxides Fe4O5 and Fe5O6 at high pressures / V. S. Zhandun, O. N. Draganyuk // International conference "Functional materials" : book of abstracts / ed. V. N. Berzhansky ; org. com. S. G. Ovchinnikov [et al.]. - Simferopol, 2021. - P. 43. - This research is funded by the Russian Foundation for Basic Research (project no. 21-52-12033)

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Berzhansky, V. N. \ed.\; Бержанский, Владимир Наумович; Ovchinnikov, S. G. \org. com.\; Овчинников, Сергей Геннадьевич; Draganyuk, O. N.; Драганюк, Оксана Николаевна; Жандун, Вячеслав Сергеевич; "Functional materials", International conference(2021 ; Oct. 4-8 ; Alushta, Russia); Крымский федеральный университет имени В.И. Вернадского
}
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