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Distribution of cobalt Co2+ ions in single crystals of spinel Li0.5Ga2.5O4 / V. V. Shapovalov, V. A. Shapovalov, T. V. Drokina [et al.] // Phys. Met. Metallogr. - 2024. - Vol. 125, Is. 1. - P. 27-32, DOI 10.1134/S0031918X23602883. - Cited References: 22 . - ISSN 0031-918X. - ISSN 1555-6190
Кл.слова (ненормированные):
electron paramagnetic resonance -- spinel single crystal -- unit cell -- crystal lattice -- structurally nonequivalent positions of ions
Аннотация: The distribution of Co2+ ions over sublattices and structurally nonequivalent positions in the unit cell of the crystal lattice of a single crystal of lithium gallium spinel Li0.5Ga2.5O4 is shown. This distribution determines the properties of both mono- and nanocrystalline substances. The distribution is obtained by a special technology and is manifested in the electron paramagnetic resonance (EPR) spectra. The distribution of Co2+ ions depends on the structural and magnetic nonequivalence. The structural and magnetic nonequivalence causes a multiminimum behavior of the crystal field potential in the unit cells of single crystals at the locations of Co2+ ions. The Co2+ ions are found in complexes with tetrahedral and octahedral oxygen ions. Three types of EPR spectra of Co2+ ions have been found and investigated. The Cotetr2+ spectrum is attributed to the Co2+ ion, which replaces the Ga3+ ion located in a tetrahedral oxygen environment. The spectrum of the Cooct2+ ion located in the crystal field with axial symmetry belongs to the Co2+ ion replacing the Li+ ion located in an octahedral oxygen environment. The spectrum of the Cooct2+ ion located in a low symmetry crystal field belongs to the Co2+ ion replacing the Ga3+ ion located in an octahedral oxygen environment. The nearest cationic environment of the ion creates rhombic distortions due to the different valence numbers of Li+ and Ga3+. The results of studying the angular dependences of the spectra show the presence of four and twelve magnetically nonequivalent positions in the unit cells.

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Держатели документа:
Math for America (MfA), New York, USA
Galkin Donetsk Institute of Physics and Engineering, 283048, Donetsk, Russia
Kirenskii Institute of Physics, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Shapovalov, V. V.; Shapovalov, V. A.; Drokina, T. V.; Дрокина, Тамара Васильевна; Vorotynov, A. M.; Воротынов, Александр Михайлович; Val'kov, V. I.; Вальков, В. И.
}
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Magnetic ion substitution and peak effect in YBCO: the strange case of Y1–xGd xBa2Cu3O7–δ / D. M. Gokhfeld, S. V. Semenov, I. V. Nemtsev [et al.] // J. Supercond. Novel Magn. - 2022. - Vol. 35, Is. 10. - P. 2679-2687, DOI 10.1007/s10948-022-06317-2. - Cited References: 50. - This work was supported by the Russian Foundation for Basic Research and the Government of the Krasnoyarsk Territory, Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project “Superconducting properties of YBCO incorporated by paramagnetic rare-earth elements” No. 20-42-240008 . - ISSN 1557-1939
Кл.слова (ненормированные):
Peak effect -- Bulk superconductors -- Critical current -- Pinning -- X-ray diffraction -- YBCO -- Doping -- Paramagnetic magnetization
Аннотация: We present the results of a study of the superconducting and paramagnetic properties of polycrystalline Y1–xGdxBa2Cu3O7–δ samples. The critical current density and critical temperature of YBCO were weakly decreased by the Gd doping. A peak effect, which is a nonmonotonic dependence of the critical current density on magnetic field, was detected for all samples. The peak position shifted to higher magnetic fields with increasing Gd content. This behavior is opposite to the shift of the peak effect observed for other YBCO compounds doped by magnetic ions. This unusual behavior is apparently related to the realized granular structure instead of the type of doping ion. A correlation between the peak position and the granule size was found in the investigated samples and other polycrystalline YBCO compounds.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Semenov, S. V.; Семёнов, Сергей Васильевич; Nemtsev, I. V.; Немцев, Иван Васильевич; Yakimov, I. S.; Balaev, D. A.; Балаев, Дмитрий Александрович
}
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    Многоминимумность потенциала кристаллического поля в координационных материалах / В. В. Шаповалов, В. А. Шаповалов, В. И. Вальков [и др.] // Физ. техн. выс. давл. - 2022. - Т. 32, № 2. - С. 52-66. - Библиогр.: 30 . - ISSN 0868-5924
   Перевод заглавия: Multi-minimum potential of crystal field in coordination materials
Кл.слова (ненормированные):
электронный парамагнитный резонанс -- монокристалл шпинели -- элементарная ячейка кристаллической решетки -- структурно-неэквивалентные положения ионов -- electron paramagnetic resonance -- single-crystal spinel -- lattice unit cell -- structurally non-equivalent positions of ions
Аннотация: Форма многоминимумного потенциала электрического кристаллического поля в нанокомплексе с магнитным ионом формируется ближайшим окружением иона и имеет несколько эквивалентных минимумов, которые соответствуют кристаллографическим осям комплекса. Для описания спектров электронного парамагнитного резонанса (ЭПР) магнитных ионов используется модель кристаллического поля и формализм спинового гамильтониана. Метод спинового гамильтониана позволяет описать спектр электронного парамагнитного резонанса. Задача теории - получение констант на основе определенной модели кристалла. Задача эксперимента - определение этих констант из вида спектра.
The form of a multi-minimum potential of the electrical crystal field in a nanocomplex with a magnetic ion is formed by the nearest environment of the ion and characterized by several equivalent minima that are associated with crystallographic axes of the complex. To describe the spectra of electron paramagnetic resonance of magnetic ions (EPR), the model of crystal and the formalism of spin Hamiltonian is used. The method of spin Hamiltonian allows description of the spectrum of electron paramagnetic resonance. The theory is aimed to calculation of the constants within the frameworks of the determined model of the crystal. The experiment goal is evaluation of these constants on the basis of the spectrum shape.

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Держатели документа:
Организация «Математика для Америки», Нью Йорк, США
Донецкий физико-технический институт им. А.А. Галкина, Донецк, Украина
Институт физики им. Л.В. Киренского РАН, Красноярск, Россия
Институт радиотехники и электроники им. В.А. Котельникова РАН, Москва, Россия

Доп.точки доступа:
Шаповалов, В. В.; Шаповалов, В. А.; Вальков, В. И.; Службин, Ю. А.; Дрокина, Тамара Васильевна; Drokina, T. V.; Воротынов, Александр Михайлович; Vorotynov, A. M.; Шавров, В. Г.
}
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Modification of polycaproamide composites based on 1H,1H,13H-rihydroperfluorotridecan-1-ol and montmorillonite / S. V. Kudashev, A. A. Kondrasenko, A. N. Maiulev [et al.] // Fibre Chem. - 2022. - Vol. 53, Is. 5. - P. 291-295, DOI 10.1007/s10692-022-10287-5. - Cited References: 24 . - ISSN 0015-0541
Кл.слова (ненормированные):
Decomposition -- Nuclear magnetic resonance spectroscopy -- Macromolecular chain -- Macroradicals -- NMR-spectroscopy -- Organoclays -- Paramagnetic centers -- Polycaproamides -- Polymer composite -- Possible mechanisms -- Stabilizing effects -- X ray structure analysis -- Clay minerals
Аннотация: Modification of polycaproamide by 1H,1H,13H-trihydroperfluorotridecan-1-ol immobilized on montmorillonite produced an F-containing polymer composite. The structure of the resulting composite was investigated using x-ray structure analysis and solid-state 19F NMR spectroscopy. The polymorphous composition of this heterochain polymer was shown to reorganize to enhance its thermal stability and diminish its flammability. Possible mechanisms for the stabilizing effect of the used modifier that were related to the involvement of organo-clay paramagnetic centers in the binding of macroradicals formed during thermal decomposition of macromolecular chains were discussed.

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Держатели документа:
Volgograd State Technical University, Volgograd, Russian Federation
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Sebryakovskii Filial, Volgograd State Technical University, Volgograd Region, Mikhailovka, Russian Federation
L. V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
I. M. Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russian Federation

Доп.точки доступа:
Kudashev, S. V.; Kondrasenko, A. A.; Кондрасенко, Александр Александрович; Maiulev, A. N.; Мацулев, Александр Николаевич; Babkin, V. A.; Belousova, V. S.; Andreev, D. S.; Zheltobryukhov, V. F.; Kuznetsova, N. V.
}
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Interplay of magnetic and superconducting subsystems in Ho-doped YBCO / D. M. Gokhfeld, S. V. Semenov, K. Y. Terentyev [et al.] // J. Supercond. Nov. Magn. - 2021. - Vol. 34. Is. 10. - P. 2537-2543, DOI 10.1007/s10948-021-05954-3. - Cited References: 26. - This work was supported by the Russian Foundation for Basic Research and the Government of the Krasnoyarsk Territory, Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project "Superconducting properties of YBCO incorporated by paramagnetic rare-earth elements" No. 20-42-240008 . - ISSN 1557-1939. - ISSN 1557-1947

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
TEMPERATURE
   TRANSPORT
   PEAK
   DY
   SUSCEPTIBILITY
   TRANSITION
   BEHAVIOR
Кл.слова (ненормированные):
Peak effect -- Bulk superconductors -- Critical current -- Pinning -- X-ray diffraction -- YBCO -- Doping -- Paramagnetic magnetization
Аннотация: Superconducting and paramagnetic contributions to the magnetization of polycrystalline Y1−xHoxBa2Cu3O7−δ samples were investigated. The superconductivity is responsible for a partial screening of magnetic ions from an external magnetic field and for a possible sinking of antiferromagnetic correlations between these ions. Magnetic moments of Ho ions influence on a peak effect induced by the order–disorder transition of the Abrikosov vortex lattice. The critical current density and the critical temperature of YBCO are not changed by the Ho doping.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Semenov, S. V.; Семёнов, Сергей Васильевич; Terentyev, K. Yu.; Терентьев, Константин Юрьевич; Yakimov, I. S.; Balaev, D. A.; Балаев, Дмитрий Александрович; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk Territory, Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project "Superconducting properties of YBCO incorporated by paramagnetic rare-earth elements" [20-42-240008]
}
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Lundin, A. A.
Solid-state NMR free induction decay, simulated by the system of classical magnetic moments and quantum correlations / A. A. Lundin, V. E. Zobov // Russ. J. Phys. Chem. B. - 2021. - Vol. 15, Is. 5. - P. 839-847, DOI 10.1134/S1990793121050079. - Cited References: 34. - This study was carried out as part of state assignment 0082-2019-0001 (registration number AAAA-A19-119012890064-7) . - ISSN 1990-7931. - ISSN 1990-7923

РУБ Physics, Atomic, Molecular & Chemical
Рубрики:
HIGH-TEMPERATURE DYNAMICS
   HEISENBERG-MODEL
   SPIN SIMULATIONS
   SHAPE
Кл.слова (ненормированные):
spin -- paramagnetic -- quantum technology -- spin dynamics -- quantum computing
Аннотация: In the past decade, nuclear magnetic resonance (NMR) has been actively used to study the basic principles of quantum computers. It is assumed that quantum correlations play a significant role in their performance. They exist at both low and high temperatures. At the same time, the time correlation functions of nuclear spin systems of solids determine the observed signals in traditional NMR implementations. The separation of such signals into quantum and classical components has not previously been carried out and will be performed in this study for the most important of the correlational functions observed in magnetic resonance: the free induction decay (FID).

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Публикация на русском языке Лундин, Андрей Арнольдович. Сигнал свободной прецессии ЯМР твердого тела, его моделирование посредством системы классических магнитных моментов и квантовые корреляции [Текст] / А. А. Лундин, В. Е. Зобов // Химич. физика. - 2021. - Т. 40 № 9. - С. 41-49

Держатели документа:
Russian Acad Sci, Semenov Fed Res Ctr Chem Phys, Moscow, Russia.
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Kirensky Inst Phys,Fed Res Ctr, Krasnoyarsk, Russia.

Доп.точки доступа:
Zobov, V. E.; Зобов, Владимир Евгеньевич; [AAAA-A19-119012890064-7]
}
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Spin state crossover in Co3BO5 / N. V. Kazak, M. S. Platunov, Y. V. Knyazev [et al.] // Phys. Rev. B. - 2021. - Vol. 103, Is. 9. - Ст. 094445, DOI 10.1103/PhysRevB.103.094445. - Cited References: 71. - We acknowledge many inspirational discussions on the topic of this paper with the late Natalia Ivanova and Leonard Bezmaternykh. The authors acknowledge A. Ney for allowing us to use the XANES spectrum of film. We are grateful to the Russian Foundation for Basic Research (Project No. 20-02-00559) and President Council on Grants (Project No. МК-2339.2020.2) for supporting this paper. This paper was carried out within the state assignment of the Russian Ministry of Science and High Education via program “Quantum”' (No. AAAA-A18-118020190095-4). We also acknowledge support by Russian Ministry of Education and Science via Contract No. 02.A03.21.0006. We acknowledge financial support from the Spanish Ministry of Economy, Industry and Competitiveness (MINECO, Grant No. MAT2017-83468-R) and from the regional Government of Aragon (E12-20R RASMIA project) . - ISSN 2469-9950
Кл.слова (ненормированные):
Carbon dioxide -- Crystal structure -- Dichroism -- Energy gap -- Hydraulic structures -- Ions -- Iron compounds -- Magnetic moments -- Magnetic susceptibility -- Single crystals -- DC magnetic susceptibility -- Effective magnetic moments -- Electronic configuration -- Generalized gradient approximations -- Magnetic sublattices -- Octahedral environment -- Paramagnetic susceptibility -- X-ray magnetic circular dichroism -- Cobalt
Аннотация: We have investigated the spin and oxidation states of Co in Co3BO5 using x-ray magnetic circular dichroism (XMCD) and dc magnetic susceptibility measurements. At low temperatures, XMCD experiments have been performed at the Co K-edge in Co3BO5 and Co2FeBO5 single crystals in the fully ferrimagnetically ordered phase. The Co (K-edge) XMCD signal is found to be related to the Co2+ magnetic sublattices in both compounds, providing strong experimental support for the low-spin (LS) Co3+ scenario. The paramagnetic susceptibility is highly anisotropic. An estimation of the effective magnetic moment in the temperature range 100–250 K correlates well with two Co2+ ions in the high-spin (HS) state and some orbital contribution, while Co3+ remains in the LS state. The crystal structure of the Co3BO5 single crystal has been solved in detail at the T range 296–703 K. The unit cell parameters and volume show anomalies at 500 and 700 K. The octahedral environment of the Co4 site strongly changes with heating. The generalized gradient approximation with Hubbard U correction calculations have revealed that, at low-temperatures, the system is insulating with a band gap of 1.4 eV, and the Co2+ ions are in the HS state, while Co3+ are in the LS state. At high temperatures (T > 700 K), the charge ordering disappears, and the system becomes metallic with all Co ions in 3d7 electronic configuration and HS state.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
M.N. Miheev Institute of Metal Physics UB RAS, Ekaterinburg, 620137, Russian Federation
Ural Federal University, Ekaterinburg, 620002, Russian Federation
Instituto de Nanociencia y Materiales de Aragon (INMA), CSIC-Universidad de Zaragoza, Departamento de Fisica de la Materia Condensada, Zaragoza, 50009, Spain
Servicio de Medidas Fisicas, Universidad de Zaragoza, Zaragoza, 50009, Spain
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
P.N. Lebedev Physical Institute of RAS, Moscow, 119991, Russian Federation
ESRF-The European Synchrotron, 71 Avenue des Martyrs CS40220, Grenoble Cedex 9, F-38043, France

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Platunov, M. S.; Платунов, Михаил Сергеевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Gorev, M. V.; Горев, Михаил Васильевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Pchelkina, Z. V.; Gapontsev, V. V.; Streltsov, S. V.; Bartolome, J.; Arauzo, A.; Yumashev, V. V.; Gavrilkin, S. Y.; Wilhelm, F.; Rogalev, A.
}
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    Распределение магнитных нанозондов S-ионов марганца как результат структурной неэквивалентности в монокристалле шпинели Li0.5Ga2.5O4 / В. В. Шаповалов, В. А. Шаповалов, А. Н. Юрасов [и др.] // Физ. техн. выс. давл. - 2021. - Т. 31, № 3. - С. 31-43. - Библиогр.: 28 . - ISSN 0868-5924
   Перевод заглавия: Distribution of magnetic nanoprobes of S-ions of manganese as a result of structural non-equivalence in a single-crystal spinel Li0.5Ga2.5O4
Кл.слова (ненормированные):
электронный парамагнитный резонанс -- монокристалл шпинели -- элементарная ячейка кристаллической решетки -- структурно неэквивалентные положения ионов -- electron paramagnetic resonance -- single-crystal spinel -- lattice unit cell -- structurally non-equivalent positions of ions
Аннотация: Показано распределение ионов марганца Mn2+ по подрешеткам и структурно неэквивалентным положениям в элементарной ячейке кристаллической решетки монокристалла литий-галлиевой шпинели Li0.5Ga2.5O4. Такое распределение и самоорганизация элементарной ячейки монокристалла происходят в процессе его роста и определяют свойства как моно-, так и нанокристаллических веществ. Самоорганизация и распределение обеспечиваются специальной технологией и проявляются в спектрах электронного парамагнитного резонанса (ЭПР).
The distribution of manganese ions Mn2+ over the sublattices and structurally nonequivalent positions within a unit cell of the lattice of single-crystal lithium-gallium spinel Li0.5Ga2.5O4 is demonstrated. The distribution and the self-organization of the unit cell of a single crystal progress in the course of the crystal growth and determine the properties of both single- and nanocrystal substances. Self-organization and distribution are provided by a special technology and affect the spectra of electron paramagnetic resonance (EPR).

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Держатели документа:
Организация «Математика для Америки», Нью Йорк, США
Донецкий физико-технический институт им. А.А. Галкина
МИРЭА – Российский технологический университет, Москва
Институт физики им. Л.В. Киренского РАН, Красноярск

Доп.точки доступа:
Шаповалов, В. В.; Шаповалов, В. А.; Юрасов, А. Н.; Вальков, В. И.; Службин, Ю. А.; Дрокина, Тамара Васильевна; Drokina, T. V.; Воротынов, Александр Михайлович; Vorotynov, A. M.
}
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Vorotynov, A. M.
EPR study of the single-ion magnetic anisotropy of the Fe3+ ion in a diamagnetic PbGaBO4 crystal / A. M. Vorotynov, A. I. Pankrats, M. I. Kolkov // J. Exp. Theor. Phys. - 2021. - Vol. 133, Is. 5. - P. 574-580, DOI 10.1134/S1063776121110054. - Cited References: 19. - This work was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Regional Science Foundation (project no. 20-42-240006 "Synthesis and study of oxide single crystals containing Pb2+ and Bi3+ with partial substitution in one of the subsystems: magnetic structures and magnetodielectric effect") . - ISSN 1063-7761. - ISSN 1090-6509

РУБ Physics, Multidisciplinary
Рубрики:
ELECTRON PARAMAGNETIC RESONANCE
TRANSITION
SrTiO3
Аннотация: Crystals of a diamagnetic PbGaBO4 analog containing a small amount (about 0.5 at %) of Fe3+ ions are grown. The single-ion EPR spectra of Fe3+ in PbGa1-xFexBO4 single crystals are analyzed with allowance for a crystal structure. The existence of four magnetically nonequivalent positions of Fe3+ ions with different local anisotropy axis directions has been confirmed. The parameters of the spin Hamiltonian written in the approximation of the local orthorhombic symmetry of a paramagnetic center are determined. The values of single-ion anisotropy constants, which are unusually high for S ions, is shown to be caused by a strong distortion of the ligand environment of Fe3+ ions. The single-ion contribution to the energy of the total magnetic anisotropy of a magnetically concentrated PbGaBO4 crystal is estimated. Two-ion mechanisms of the Fe–Fe interaction anisotropy are assumed to play a dominant role in the formation of magnetic anisotropy in a magnetically concentrated crystal.

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Публикация на русском языке Воротынов, Александр Михайлович. Исследование одноионной магнитной анизотропии иона Fe3+ методом ЭПР в диамагнитном кристалле PbGaBO4 [Текст] / А. М. Воротынов, А. И. Панкрац, М. И. Колков // Журн. эксперим. и теор. физ. - 2021. - Т. 160 Вып. 5. - С. 670-677

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Pankrats, A. I.; Панкрац, Анатолий Иванович; Kolkov, M. I.; Колков, Максим Игоревич; Воротынов, Александр Михайлович; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk Territory; Krasnoyarsk Regional Science Foundation [20-42-240006]
}
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10.

Mechanisms of the magnetoresistance hysteresis in a granular HTS with the paramagnetic contribution by the example of HoBa2Cu3O7-δ / S. V. Semenov, D. M. Gokhfel'd, K. Y. Terent'ev, D. A. Balaev // Phys. Solid State. - 2021. - Vol. 63, Is. 12. - P. 1785-1794, DOI 10.1134/S1063783421100334. - Cited References: 72. - This study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk krai, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project no. 20-42-240008 "Effect of introduction of paramagnetic ions of rare-earth elements on the superconducting properties of YBCO materials" . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTOR
MAGNETIC-FLUX COMPRESSION
Кл.слова (ненормированные):
HoBa2Cu3O7–δ granular HTS -- paramagnetic contribution -- magnetoresistance hysteresis -- effective field -- grain boundaries
Аннотация: The hysteretic behavior of magnetoresistance R(H) of the granular high-temperature superconductor (HTS) HoBa2Cu3O7 – δ has been investigated. The YBCO superconductors with a rare-earth element (Nd, Ho, Er, Sm, Yb, or Dy) with the magnetic moment in the yttrium site are characterized by a significant paramagnetic contribution to the total magnetization. The main goal of this study has been to establish the possible effect of this paramagnetic contribution on the magnetotransport properties, which are determined by tunneling of superconducting current carriers through the grain boundaries. An analysis of the results obtained basing on the concept of an effective field in the intergrain medium showed that the distribution of the magnetic induction lines from the paramagnetic moments is fundamentally different from that of the Meissner currents and Abrikosov vortices. The magnetic induction lines from the paramagnetic moments are not concentrated in the region of grain boundaries and therefore insignificantly affect the magnetotransport properties of a granular HTS. At the same time, the magnetic induction lines are strongly concentrated in the grain boundaries, which is caused by the Meissner currents and Abrikosov vortices, due to the features of their properties. Specifically, the magnetic flux compression determines the magnetotransport (in particular, the R(H) hysteresis) properties of granular HTSs, including 1–2–3 ones, with a rare-earth ion with the magnetic moment.

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Публикация на русском языке Механизмы, определяющие гистерезис магнитосопротивления гранулярного ВТСП в присутствии парамагнитного вклада, на примере HoBa2Cu3O7-δ [Текст] / С. В. Семенов, Д. М. Гохфельд, К. Ю. Терентьев, Д. А. Балаев // Физ. тверд. тела. - 2021. - Т. 63 Вып. 10. - С. 1462-1470

Держатели документа:
Russian Acad Sci, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Semenov, S. V.; Семёнов, Сергей Васильевич; Gokhfel'd, D. M.; Гохфельд, Денис Михайлович; Terent'ev, K. Yu.; Терентьев, Константин Юрьевич; Balaev, D. A.; Балаев, Дмитрий Александрович; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk krai; Krasnoyarsk Territorial Foundation for Support of Scientific and RD Activities [20-42-240008]
}
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11.

    Analysis of Ehrlich ascites carcinoma with electron paramagnetic resonance / N. V. Latyshev, O. V. Kryukova, V. F. Pyankov, S. V. Stolyar // IEEE Ural-Siberian conference on computational technologies in cognitive science, genomics and biomedicine (CSGB). - 2021. - Ст. 9496012. - P. 290-293DOI 10.1109/CSGB53040.2021.9496012. - Cited References: 10
   Перевод заглавия: Анализ асцитной карциномы Эрлиха с помощью электронного парамагнитного резонанса
Аннотация: The study was aimed to reveal the dependence of changes in the content of metal-containing proteins and freeradical forms in a suspension of the experimental tumor in different periods of tumor growth using electron paramagnetic resonance. The object of the study was Ehrlich's ascites carcinoma, an experimental undifferentiated tumor, which is used to study various aspects of tumor development under external influences. Ehrlich ascites carcinoma was inoculated into the peritoneal cavity of laboratory mice. We believe that the determination of the concentrations of metal-containing proteins and free-radical forms using this method may be an important prognostic parameter for assessing the state of the tumor. Changes in metabolism will inevitably affect the functionality of cells and, as a consequence, the dynamics of tumor growth. The results of the study showed that metalcontaining proteins belonging to ascites plasma, such as transferrin, ferritin and ceruloplasmin, do not undergo significant changes. The signal from molybdenum-containing proteins also does not change at the stages of experimental tumor growth under consideration. However, in the course of this experiment, it was possible to record a slight decrease in the intensity of the formation of denitrosyl iron complexes with the development of a tumor in the body.

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Держатели документа:
Kirensky Institute of Physics Sb Ras, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Latyshev, N. V.; Kryukova, O. V.; Pyankov, V. F.; Stolyar, S. V.; Столяр, Сергей Викторович; IEEE Ural-Siberian Conference on Computational Technologies in Cognitive Science, Genomics and Biomedicine(2021 ; May 26-28 ; Novosibirsk / Yekaterinburg); Урало-Сибирская конференция по вычислительным технологиям в когнитивной науке, геномике и биомедицине(2021 ; 26-28 мая ; Новосибирск / Екатеринбург); Институт цитологии и генетики СО РАН
}
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12.

Magnetoimpedance, Jahn-Teller transitions upon electron doping of manganese sulfide / S. S. Aplesnin, M. N. Sitnikov, A. M. Kharkov [et al.] // J. Magn. Magn. Mater. - 2020. - Vol. 513. - Ст. 167104, DOI 10.1016/j.jmmm.2020.167104. - Cited References: 42. - This study was supported by youth project_Reshetnev Siberian State University of Science and Technology . - ISSN 0304-8853
Кл.слова (ненормированные):
Impedance -- Prehistory of magnetic susceptibility -- Magnetoimpedance -- Fermi glass -- Orbital magnetic moment -- Electron paramagnetic resonance -- IR spectra -- JT transitions -- Conductivity
Аннотация: The effect of a magnetic field on the electrical and magnetic properties of manganese sulfide upon electron doping in the YbxMn1−xS (0.05 ˂ x ˂ 0.2) compound has been investigated. The change in the conductivity type from the Poole–Frenkel to Mott law have been established using the I–V characteristics and the change in the carrier type upon temperature and concentration variations has been observed. The effect of the sample prehistory on the conductivity, impedance, and magnetic susceptibility under the action of a magnetic field in a wide temperature range has been found. The trivalent state of ytterbium ions has been determined using the electron paramagnetic resonance study. The dynamic JT transitions temperature are found by IR method and by the electron paramagnetic resonance. Anomalies of carrier mobility and magneto-impedance were found in the vicinity of the Jahn-Teller transitions. The experimental data are explained by the localization of electrons with the formation of the interstitial orbital momenta and an orbital momentum into the site. The sample prehistory is related to the lifting of the orbital angular moments degeneracy and the direction of the axis of distortion of the octahedrons in a magnetic field.

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Держатели документа:
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok, 50, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Sitnikov, M. N.; Kharkov, A. M.; Konovalov, S. O.; Vorotinov, A. M.; Воротынов, Александр Михайлович
}
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13.

Hard X-ray magnetochiral dichroism in a paramagnetic molecular 4f complex / D. Mitcov, M. Platunov, C. D. Buch [et al.] // Chem. Sci. - 2020. - Vol. 11, Is. 31. - P. 8306-8311, DOI 10.1039/d0sc02709j. - Cited References: 74. - SP thanks the VILLUM FONDEN for research grant 13376. SP and DM thank the Danish Ministry of Higher Education and Science for travel support through the Instrument Center DANSCATT. AR thanks the Carlsberg Foundation (grant CF18-0613) and the Independent Research Fund Denmark (grant 9036-00015B) for funding. MP thanks the Russian Science Foundation (grant 19-72-00002) for funding . - ISSN 2041-6520. - ISSN 2041-6539

РУБ Chemistry, Multidisciplinary
Рубрики:
CHIRAL DICHROISM
   SINGLE-CRYSTAL
   SPIN QUBITS
   READ-OUT
   L3-EDGE
Аннотация: Magnetochiral dichroism (MΧD) originates in the coupling of local electric fields and magnetic moments in systems where a simultaneous break of space parity and time-reversal symmetries occurs. This magnetoelectric coupling, displayed by chiral magnetic materials, can be exploited to manipulate the magnetic moment of molecular materials at the single molecule level. We demonstrate herein the first experimental observation of X-ray magnetochiral dichroism in enantiopure chiral trigonal single crystals of a chiral mononuclear paramagnetic lanthanide coordination complex, namely, holmium oxydiacetate, at the Ho L3-edge. The observed magnetochiral effect is opposite for the two enantiomers and is rationalised on the basis of a multipolar expansion of the matter–radiation interaction. These results demonstrate that 4f–5d hybridization in chiral lanthanoid coordination complexes is at the origin of magnetochiral dichroism, an effect that could be exploited for addressing of their magnetic moment at the single molecule level.

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Держатели документа:
Univ Copenhagen, Dept Chem, Univ Pk 5, DK-2100 Copenhagen, Denmark.
ESRF European Synchrotron, CS 40220, F-38043 Grenoble 9, France.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Akademgorodok 50,Bld 38, Krasnoyarsk 660036, Russia.
Univ Penn, Dept Chem, 231 South 34th St, Philadelphia, PA 19014 USA.

Доп.точки доступа:
Mitcov, D.; Platunov, M. S.; Платунов, Михаил Сергеевич; Buch, C. D.; Reinholdt, A.; Dossing, A. R.; Wilhelm, F.; Rogalev, A.; Piligkos, S.; VILLUM FONDEN [13376]; Carlsberg FoundationCarlsberg Foundation [CF18-0613]; Independent Research Fund Denmark [9036-00015B]; Russian Science FoundationRussian Science Foundation (RSF) [19-72-00002]
}
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14.

Проявление спиновых корреляций в монокристалле ErAl3(BO3)4 / В. А. Бедарев [и др.] // Физ. низких температур. - 2019. - Т. 45, № 9. - С. 1217-1222. - Библиогр.: 15 . - ISSN 0132-6414. - ISSN 1816-0328
Кл.слова (ненормированные):
электронный парамагнитный резонанс -- теплоемкость -- спин-спиновое взаимодействие -- магнитные кластеры -- електронний парамагнітний резонанс -- теплоємність -- спін-спінова взаємодія -- магнітні кластери -- еlectronic paramagnetic resonance -- heat capacity -- spin-spin interaction -- magnetic clusters
Аннотация: Установлено наличие существенного магнитного вклада в удельную теплоемкость монокристалла ErAl3(BO3)4 при температурах менее 5 К. Результаты измерений спектров ЭПР при 4,2 К также свидетельствуют о проявлении ближнего магнитного порядка. Полученные данные обсуждаются в рамках модели, учитывающей спин-спиновое взаимодействие между редкоземельными ионами в парных кластерах.
Встановлено присутність суттєвого магнітного внеску в питому теплоємність монокристалу ErAl3(BO3)4 при температурах нижче 5 К. Результати вимірювань спектрів ЕПР при температурі 4,2 К також свідчать про прояв близького магнітного порядку. Отримані дані обговорюються у рамках моделі, яка враховує спін-спінову взаємодію між рідкісноземельними іонами у парних кластерах.

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Переводная версия Manifestation of Spin Correlations in Monocrystalline ErAl3(BO3)4 [Текст] / V. A. Bedarev [et al.] // Low Temp. Phys. - 2019. - Vol. 45 Is. 9.- P.1041-1045

Держатели документа:
Физико-технический институт низких температур им. Б.И. Веркина НАН Украины пр. Науки, 47, г. Харьков, 61103, Украина
Institute of Physics, Polish Academy of Sciences, Warsaw, Poland
Институт физики им. Л.В. Киренского ФИЦ КНЦ СO РАН, г. Красноярск, Россия

Доп.точки доступа:
Бедарев, В. А.; Меренков, Д. Н.; Кобец, М. И.; Звягин, А. А.; Попережай, С. Н.; Гнатченко, С. Л.; Zajarniuk, T.; Vasevych, T.; Gutowska, M. U.; Szewczyk, A.; Гудим, Ирина Анатольевна; Gudim, I. A.
}
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15.

Magnetoresistance and magnetoimpedance in LuxMn1-xS solid solutions paramagnetic state / S. S. Aplesnin [и др.] // Euro-asian symposium "Trends in magnetism" (EASTMAG-2019) : Book of abstracts / чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 2. - Ст. K.O5. - P. 305-306. - Cited References: 2. - The reported study was funded by Russian Foundation for Basic Research No. 18-32-00079 mol_a, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science No. 18-42 240001 r_a, tothe research project: ”Inversion ofthe sign ofthe components ofthe magnetoelectrictensor onthe temperature in films of bismuth garnet ferrite replaced by neodymium” . - ISBN 978-5-9500855-7-4

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, Russia

Доп.точки доступа:
Ovchinnikov, S. G. \чл. конс. ком.\; Овчинников, Сергей Геннадьевич; Volkov, N. V. \чл. конс. ком.\; Волков, Никита Валентинович; Dzebisashvili, D. M. \чл. прогр. ком.\; Дзебисашвили, Дмитрий Михайлович; Aplesnin, S. S.; Аплеснин, Сергей Степанович; Begisheva, O. B.; Sitnikov, M. N.; Yukhno, M. Yu.; Российская академия наук; Уральское отделение РАН; Институт физики металлов им. М. Н. Михеева Уральского отделения РАН; Уральский федеральный университет им. первого Президента России Б.Н. Ельцина; Российский фонд фундаментальных исследований; Euro-Asian Symposium "Trends in MAGnetism"(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg); "Trends in MAGnetism", Euro-Asian Symposium(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg)
Нет сведений об экземплярах (Источник в БД не найден)
}
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16.

Formation of the magnetic subsystems in antiferromagnetic NiO nanoparticles using the data of magnetic measurements in fields up to 250 kOe / S. I. Popkov [et al.] // J. Magn. Magn. Mater. - 2019. - Vol. 483. - P. 21-26, DOI 10.1016/j.jmmm.2019.03.004. - Cited References: 76. - We are grateful S.V. Semenov and A.A. Dubrovskiy for their help, S.V. Komogortsev and A.D. Balaev for fruitful discussions, and M.N. Volochaev for the TEM measurements. The TEM investigations were carried out on the equipment of the Center of Collective Use of the Federal Research Center “Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences”. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project: «Magnetic reversal of magnetic nanoparticles in strong pulsed magnetic fields - a new approach to the study of dynamic effects associated with the magnetization of magnetic nanoparticles» (project no. 18-42-240012). . - ISSN 0304-8853
Кл.слова (ненормированные):
Antiferromagnetic nanoparticle -- External magnetic field -- Low temperature regions -- Magnetic subsystems -- Magnetically actives -- Magnetization curves -- Paramagnetic subsystems -- Pulsed magnetic fields -- Magnetic bubbles
Аннотация: It is well-known that the fraction of surface atoms and the number of defects in an antiferromagnetic particle increase with a decrease in the particle size to tens of nanometers, which qualitatively changes the properties of the particle. Specifically, in antiferromagnetic nanoparticles, spins in the ferromagnetically ordered planes can partially decompensate; as a result, an antiferromagnetic particle acquires a magnetic moment. As a rule, uncompensated chemical bonds of the surface atoms significantly weaken the exchange coupling with the antiferromagnetic particle core, which can lead to the formation of an additional magnetic subsystem paramagnetic at high temperatures and spin-glass-like in the low-temperature region. The existence of several magnetic subsystems makes it difficult to interpret the magnetic properties of antiferromagnetic nanoparticles. It is shown by the example of NiO nanoparticles with an average size of 8 nm that the correct determination of the contributions of the magnetic subsystems forming in antiferromagnetic nanoparticles requires magnetic measurements in much stronger external magnetic fields than those commonly used in standard experiments (up to 60–90 kOe). An analysis of the magnetization curves obtained in pulsed magnetic fields up to 250 kOe allows one to establish the contributions of the uncompensated particle magnetic moment μun, paramagnetic subsystem, and antiferromagnetic particle core. The μun value obtained for the investigated NiO particles is consistent with the Néel model, in which μun ∼ N1/2 (N is the number of magnetically active atoms in a particle), and thereby points out the existence of defects on the surface and in the bulk of a particle. It is demonstrated that the anomalous behavior of the high-field susceptibility dM/dH of antiferromagnetic NiO nanoparticles, which was observed by many authors, is caused by the existence of a paramagnetic subsystem, rather than by the superantiferromagnetism effect.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences”, Krasnoyarsk, 660036, Russian Federation
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russian Federation

Доп.точки доступа:
Popkov, S. I.; Попков, Сергей Иванович; Krasikov, A. A.; Красиков, Александр Александрович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Kirillov, V. L.; Martyanov, O. N.; Balaev, D. A.; Балаев, Дмитрий Александрович
}
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17.

    Proximity of Ferromagnetic Nickel to Paramagnetic Instability / N. G. Zamkova [et al.] // JETP Letters. - 2019. - Vol. 109, Is. 4. - P. 276-279, DOI 10.1134/S0021364019040131. - Cited References: 21. - This work was supported by the Russian Foundation for Basic Research (project no. 16-02-00273). . - ISSN 0021-3640. - ISSN 1090-6487
Рубрики:
TOTAL-ENERGY CALCULATIONS
   WAVE
Аннотация: The phase diagram of Ni in the space of the parameters has been studied within the Kanamori model with the parameters determined from comparison with ab initio calculations for ferromagnetic Ni. The proximity of Ni to the boundary of the transition to a paramagnetic state has been found.

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Публикация на русском языке Близость ферромагнитного никеля к парамагнитной неустойчивости [Текст] / Н. Г. Замкова [и др.] // Письма в ЖЭТФ. - 2019. - Т. 109 Вып. 4. - С. 265-268

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Fed Res Ctr KSC, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Zamkova, N. G.; Замкова, Наталья Геннадьевна; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Sandalov, I. S.; Сандалов, Игорь Семёнович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Foundation for Basic Research [16-02-00273]
}
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18.

Aplesnin, S. S.
Magnetoelectric Effect in a Paramagnetic Region in Gd0.15Mn0.85Se / S. S. Aplesnin, V. V. Kretinin, O. B. Begisheva // Phys. Solid State. - 2019. - Vol. 61, Is. 8. - P. 1379-1382, DOI 10.1134/S1063783419080067. - Cited References: 16. - This work was supported by the Russian foundation for Basic Research, the Government of the Krasnoyarsk region, and Krasnoyarsk Regional Foundation for Science in the framework of the scientific project no. 18-42-240001 "Inversion of the sign of components of the magnetoelectric tensor in temperature in neodymium-substituted bismuth ferrite-garnet films," grant MK 591.2019.2, and state task no. 3.5743.2017/6.7. . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
MULTIFERROICS
Кл.слова (ненормированные):
magnetoelectric effect -- migration polarization -- hysteresis -- polarization
Аннотация: The electric polarization in a zero magnetic field and in a magnetic field of 12 kOe is measured in a GdxMn1 – xSe solid solution in the percolation concentration region in the temperature range 80–380 K. For composition x = 0.15, the polarization hysteresis and the dependence of the remanent polarization on magnetic field and temperature are determined. The hysteresis is explained in the model of migration polarization and the magnetoelectric effect is explained in the Maxwell–Wagner model.

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Публикация на русском языке Аплеснин, Сергей Степанович. Магнитоэлектрический эффект в парамагнитной области в Gd0.15Mn0.85Sе [Текст] / С. С. Аплеснин, В. В. Кретинин, О. Б. Бегишева // Физ. тверд. тела. - 2019. - Т. 61 Вып. 8. - С. 1433-1436

Держатели документа:
KSC SB RAS, Independent Subdiv Fed Ctr, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660000, Russia.

Доп.точки доступа:
Kretinin, V. V.; Begisheva, O. B.; Аплеснин, Сергей Степанович; Russian foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk region; Krasnoyarsk Regional Foundation for Science [18-42-240001, MK 591.2019.2, 3.5743.2017/6.7]
}
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19.

Paramagnetic magneto-optical activity of f-f transitions in HoFe3(BO3)4 and HoAl3(BO3)4 single crystals / V. V. Sokolov [et al.] // Opt Mater. - 2019. - Vol. 94. - P. 35-40, DOI 10.1016/j.optmat.2019.05.024. - Cited References: 38. - The work was supported by the Russian Foundation for Basic Researches grant 19-02-00034. . - ISSN 0925-3467
Кл.слова (ненормированные):
Magnetic circular dichroism -- f-f transitions -- Rare earth ferroborates -- Rare earth alumoborates
Аннотация: Absorption and magnetic circular dichroism (MCD) spectra of HoFe3(BO3)4 and HoAl3(BO3)4 single crystals were measured as a function of temperature in the range of 90–293 K. Based on integrals of f-f absorption and МСD bands, temperature dependences of the paramagnetic magneto-optical activity (MOA) of f-f transitions were obtained for the first time. It was revealed that MOA of the same f-f transitions in the studied crystals were substantially different and their temperature dependences did not follow the Curie-Weiss law in contrast to the properties of allowed transitions. The observed phenomena were accounted for as a consequence of the nature of f-f transitions allowance. In temperature dependences of the MOA of two transitions the singularities were revealed, which indicated to some local structural distortions in the corresponding excited states.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Sokolov, V. V.; Соколов, Валерий Владимирович; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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20.

Features of electronic paramagnetic resonance in the ErAl3(BO3)4 single crystal / V. A. Bedarev [et al.] // Low Temp. Phys. - 2018. - Vol. 44, Is. 8. - P. 863-865, DOI 10.1063/1.5049175. - Cited References: 12 . - ISSN 1063-777X. - ISSN 1090-6517

РУБ Physics, Applied
Рубрики:
PHASES
Аннотация: An additional resonance line was found in the EPR spectrum of the ErAl3(BO3)4 crystal at a temperature of 4.2 K, along with the main line. The appearance of an additional line is associated with the possible formation of magnetic clusters in the crystal.

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Публикация на русском языке Особенности электронного парамагнитного резонанса в монокристалле ERAL3(BO3)4 [Текст] / В. А. Бедарев [и др.] // Физика низк. темп. - 2018. - Т. 44 № 8. - С. 1104-1107

Держатели документа:
Natl Acad Sci Ukraine, B Verkin Inst Low Temp Phys & Engn, 47 Nauky Ave, UA-61103 Kharkov, Ukraine.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Bedarev, V. A.; Merenkov, D. N.; Kobets, M. I.; Poperezhaj, S. N.; Gnatchenko, S. L.; Gudim, I. A.; Гудим, Ирина Анатольевна
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