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    Магнитные свойства и электрическая поляризация при гетерогенном замещении в пиростаннате висмута Bi2(Sn0.9Ме0.1)2O7, Ме= Cr3+, Fe3+ / Л. В. Удод, О. Б. Романова, М. Н. Ситников, Х. Абдельбаки // Сиб. аэрокосм. журн. - 2022. - Т. 23, № 3. - С. 561-571 ; Sib. Aerospace J., DOI 10.31772/2712-8970-2022-23-3-561-571. - Библиогр.: 37. - Работа выполнена при финансовой поддержке РФФИ, Красноярского края и Красноярского краевого фонда науки, проект No 20-42-243002 . - ISSN 2712-8970
   Перевод заглавия: Magnetic properties and electric polarization at heterogeneous substitution in bismuth pyrostannate Bi2(Sn0.9МЕ0.1)2O7, Ме = Cr3+, Fe3+
Кл.слова (ненормированные):
рентгеноструктурный анализ -- электрическая поляризация -- магнитная восприимчивость -- гистерезис электрической поляризации -- X-ray diffraction analysis -- electric polarization -- magnetic susceptibility -- electric polarization hysteresis
Аннотация: Пиростаннат висмута Bi2Sn2O7 является диамагнетиком и относится к структурному типу класса пирохлора А2В2О7. В этом классе соединений, при наличии магнитных ионов, проявляются очень интересные магнитные свойства. Хром- и железозамещенные пиростаннаты висмута Bi2(Sn0.9Ме0,1)2O7, Ме = Cr и Fe синтезированы методом твердофазного синтеза. Рентгеноструктурный анализ показал, что образцы соответствуют моноклинной ячейке Pc в α-фазе Bi2Sn2O7 при комнатной температуре. Изучены магнитные свойства до 1100 К в магнитных полях до 0,86 Т и электрическая поляризация на частотах 10, 3 и 1 mHz в интервале температур 80–550 К. Исследовано влияние гетерогенного замещения ионами Cr3+ и Fe3+ на магнитные свойства и электрическую поляризацию. Анализ экспериментальных данных выявил зависимость магнитных свойств от степени заполнения электронных оболочек ионов хрома и железа. Соединение Bi2(Sn0,9Cr0,1)2O7 проявляет ферромагнитные свойства, а Bi2(Sn0,9Fe0,1)2O7 – антиферромагнитные. В хромзамещенном пиростаннате висмута при α→β переходе парамагнитная температура Кюри возрастает в 3 раза. Температурная зависимость обратной магнитной восприимчивости характеризуется гистерезисом в районе температур 400–900 К. Обратная магнитная восприимчивость Bi2(Sn0,9Fe0,1)2O7 во всем температурном интервале удовлетворительно описывается законом Кюри–Вейсса. Исследования магнитных свойств установили, что ионы Fe3+ находятся в высокоспиновом состоянии. Найден гистерезис поляризации в Bi2(Sn0,9Cr0,1)2O7, который смещается по оси поляризации и зависит от температуры. Bi2(Sn1–хFeх)2O7, х = 0,1 характеризуется линейной полевой зависимостью. С увеличением концентрации ионов железа возникает гистерезис полевой зависимости электрической поляризации. Нелинейная полевая зависимость поляризации в Bi2(Sn0,8Fe0,2)2O7 объяснятся взаимодействием дипольной и миграционной поляризаций. Для соединения Bi2(Sn0,9Cr0,1)2O7 обнаружен переход в состояние дипольного стекла. В β-фазе Bi2(Sn0,8Fe0,2)2O7 выше Т = 400 К гистерезис поляризации не наблюдается и преобладает электронно-релаксационная поляризация. Механизм возникновения электронной поляризации объясняется с возникновением анионных вакансий при гетерогенном замещении ионов олова.
Bismuth pyrostannate Bi2Sn2O7 is a diamagnet and belongs to the structural type of the A2B2O7 pyrochlore class. In this class of compounds, in the presence of magnetic ions, very interesting magnetic properties appear. Chromium- and iron-substituted bismuth pyrostannates Bi2(Sn0.9Me0.1)2O7, Me = Cr, and Fe were synthesized by solid-phase synthesis. X-ray diffraction analysis showed that the samples correspond to the Pc monoclinic cell of the Bi2Sn2O7 α-phase at room temperature. The magnetic properties up to 1100 K in magnetic fields up to 0.86 T and the electric polarization at frequencies of 10, 3, and 1 mHz in the temperature range 80-550 K have been studied. The effect of heterogeneous substitution by Cr3+ and Fe3+ ions on the magnetic properties and electric polarization of bismuth pyrostannate is investigated. An analysis of the experimental data revealed the dependence of the magnetic properties on the degree of filling of the electron shells of chromium and iron ions. The Bi2(Sn0.9Cr0.1)2O7 compound exhibits ferromagnetic properties, while Bi2(Sn0.9Fe0.1)2O7 exhibits antiferromagnetic properties. In chromium-substituted bismuth pyrostannate during the α→β transition, the paramagnetic Curie temperature increases by a factor of 3. The temperature dependence of the inverse magnetic susceptibility is characterized by hysteresis in the temperature range of 400-900 K. The reverse magnetic susceptibility of Bi2(Sn0.9Fe0.1)2O7 in the entire temperature range is satisfactorily described by the Curie-Weiss law. Studies of the magnetic properties have established that the Fe3+ ions are in a high-spin state. The polarization hysteresis in Bi2(Sn0.9Cr0.1)2O7 is found, which shifts along the polarization axis and depends on temperature. Bi2(Sn1-xFex)2O7, x=0.1 is characterized by a linear field dependence. With an increase in the concentration of iron ions, a hysteresis arises in the field dependence of the electric polarization. The hysteresis of polarization in Bi2(Sn0.9Cr0.1)2O7 which depends on temperature was found. The nonlinear field dependence of the polarization in Bi2(Sn0.8Fe0.2)2O7 can be explained by the interaction of the dipole and migration polarizations and the presence of oxygen vacancies. For the Bi2(Sn0.9Cr0.1)2O7 compound, a transition to the dipole glass state was found. In the β-phase of Bi2(Sn0.8Fe0.2)2O7 above T = 400 K, no polarization hysteresis is observed and the electron-relaxation polarization predominates. The mechanism of the occurrence of electronic polarization is explained with the appearance of anionic vacancies upon heterogeneous substitution of tin ions.

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Институт физики имени Л. В. Киренского СО РАН – обособленное подразделение ФИЦ КНЦ СО РАН, Российская Федерация, 660036, г. Красноярск, Академгородок, 50, стр. 38
Сибирский государственный университет науки и технологий имени академика М. Ф. Решетнева, Российская Федерация, 660037, г. Красноярск, просп. им. газ. «Красноярский Рабочий», 31

Доп.точки доступа:
Удод, Любовь Викторовна; Udod, L. V.; Романова, Оксана Борисовна; Romanova, O. B.; Ситников, Максим Николаевич; Sitnikov, M. N.; Абдельбаки, Х.

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    Коршунов, Максим Михайлович.
    Взаимосвязь сверхпроводимости и магнитных возбуждений в многоорбитальных системах / М. М. Коршунов, Ю. Н. Тогушова // Вестн. Новосиб. гос. ун-та. Сер.: Физика. - 2015. - Т. 10, Вып. 2. - С. 83-90. - Библиогр.: 29 назв. - Материал данной работы был доложен на семинаре ОКНО-2014. Работа была выполнена при поддержке Минобрнауки РФ ГФ-2 (СФУ), РФФИ (грант 13-02-01395), программы Президиума РАН № 20.7, при государственной поддержке ведущих научных школ НШ-2886.2014.2, фонда «Династия» и МЦФФМ . - ISSN 1818-7994
   Перевод заглавия: Interplay of superconductivity and magnetic excitations in multiorbital systems
Кл.слова (ненормированные):
сверхпроводники на основе железа -- спин-резонансный пик -- спиновая восприимчивость -- Fe-based superconductors -- spin-resonance peak -- spin susceptibility
Аннотация: Рассмотрено влияние нетривиального сверхпроводящего параметра порядка на магнитную восприимчивость в многоорбитальной модели соединений железа. Показано, как формируется спин-резонансный пик, обсуждается его связь с экспериментальными данными по неупругому рассеянию нейтронов.
We have considered the impact of the nontrivial superconducting order parameter on the magnetic susceptibility within the multiorbital model for the iron-based materials. The formation of the spin-resonance peak is demonstrated and its connection to the experimental data on the inelastic neutron scattering is discussed.

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Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Тогушова, Ю. Н.; Togushova, Yu. N.; Korshunov, M. M.
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    Корреляция магнитных свойств и содержания железа в продуктах мокрой магнитной сепарации / Э. К. Якубайлик [и др.] // Изв. вузов. Черн. металлургия. - 2015. - Т. 58, № 10. - С. 744-748, DOI 10.17073/0368-0797-2015-10-744-748. - Библиогр.: 10 . - ISSN 0368-0797
   Перевод заглавия: Correlation of magnetic parameters and iron content in products of wet magnetic separation
Кл.слова (ненормированные):
мокрая сепарация -- слив -- концентрат -- удельная намагниченность насыщения -- удельная магнитная восприимчивость -- wet separation -- discharge -- concentrate -- specific saturation magnetization -- specific magnetic susceptibility
Аннотация: Изучено изменение одного из основных параметров мокрого магнитного обогащения - содержания железа - и магнитных характеристик продуктов по технологической схеме обогащения Абагурской обогатительной фабрики (от слива классификаторов до концентрата 2-й стадии). Количество железа в пробах заметно растет с уменьшением крупности частиц. Приращение содержания железа магнетитового по схеме составляет 27,43 %, удельная намагниченности насыщения σ возрастает на 25,8 А·м2/кг; в поле сепарации Н = 175 кА/м прирост удельной намагниченности насыщения аналогичен - 25,76 А·м2/кг. Значения удельной магнитной восприимчивости χ в концентрате в сравнении со сливом выше. С ростом напряженности поля сепарации удельная восприимчивость продуктов уменьшается в несколько раз. По всей схеме обогащения наблюдается пропорциональность значений содержания железа и магнитных параметров продуктов. Учитывая эту закономерность, магнитные характеристики продуктов можно использовать для контроля и регулирования технологических режимов процессов мокрого магнитного обогащения.
The change of one of the main parameters of wet magnetic concentration – the iron content and magnetic characteristics of products made by the concentration technological scheme of Abagur Enrichment Plant (from classifi er discharge to concentrate of the 2nd stage) has been studied. The iron content in the samples is growing signifi - cantly with the decrease of the particle coarseness. The increment of iron magnetite by the scheme is 27.43 %, the specifi c value of saturation magnetization σs increases by 25.8 A·m2/kg. The growth of specifi c magnetization in the separation fi eld H = 175 kA/m is similar – 25.76 A·m2/kg. The values of specifi c magnetic susceptibility χ in the concentrate are higher in comparison with the discharge. The specifi c product susceptibility decreases in several times with the growth of separation fi eld strength. Throughout the concentration scheme the quantity proportionality of iron content and magnetic parameters of products is observed. Taking into an account all the regularities, magnetic characteristics of the products can be used to control and regulate the process of technological modes of wet magnetic separation processes.

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Якубайлик, Эдуард Константинович; Yakubailik, E. K.; Балаев, Александр Дмитриевич; Balaev, A. D.; Ганженко, Игорь Михайлович; Ganzhenko I. M.; Бутов, Павел Юрьевич; Butov P. Yu.
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    Динамическая магнитная восприимчивость периодической модели Андерсона в приближении хаотических фаз [Текст] / В. В. Вальков, Д. М. Дзебисашвили // Теоретическая и математическая физика. - 2010. - Т. 164, № 2. - С. 309-320, DOI 10.4213/tmf6541 . - ISSN 0564-6162. - ISSN 2305-3135
   Перевод заглавия: Dynamical magnetic susceptibility of the periodic Anderson model in the chaotic phase approximation
Кл.слова (ненормированные):
периодическая модель Андерсона -- обобщенное приближение хаотических фаз -- динамическая магнитная восприимчивость
Аннотация: Методом диаграммной техники в атомном представлении в обобщенном приближении хаотических фаз решена задача о вычислении динамической магнитной восприимчивости периодической модели Андерсона в режиме сильных электронных корреляций. Динамическая магнитная восприимчивость выражена через четыре мацубаровские функции Грина, описывающие парциальные вклады и вычисленные из точных решений интегральных уравнений.

РИНЦ
Держатели документа:
Институт физики им. Л. В. Киренского СО РАН
Сибирский государственный аэрокосмический университет имени академика М. Ф. Решетнева

Доп.точки доступа:
Вальков, Валерий Владимирович; Дзебисашвили, Дмитрий Михайлович
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Weak ferromagnetism in copper metaborate CuB2O4 / G. A. Petrakovskii [et al.] // Phys. Solid State. - 1999. - Vol. 41, Is. 7. - P. 1157-1161, DOI 10.1134/1.1130957. - Cited References: 10 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
SUSCEPTIBILITY
Аннотация: CuB2O4 single crystals have been grown and their magnetic and resonance properties have been investigated for the first time. The temperature dependence of the susceptibility was found to contain features at T = 21 and 10 K. The CuB2O4 single crystal transformed at T = 21 K to a weakly ferromagnetic state. The sharp drop in susceptibility at T 10 K is caused by a transition of the magnetic system of CuB2O4 to an antiferromagnetic state. The effective magnetic moment of the Cu2+ ion, determined from the high-temperature part of the magnetic susceptibility, is 1.77 mu(B). The room-temperature g factors are, respectively, 2.170 and 2.133 for magnetic field parallel and perpendicular to the c axis of the crystal. The antiferromagnetic resonance parameters in the weakly ferromagnetic and antiferromagnetic phases were measured. (C) 1999 American Institute of Physics. [S1063-7834(99)02907-X].

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Публикация на русском языке Слабый ферромагнетизм в метаборате меди CuB2O4 [Текст] / Г. А. Петраковский, К. А. Саблина, Д. А. Великанов [и др.] // Физ. тверд. тела. - 1999. - Т. 41 Вып. 7. - С. 1267-1271

Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
L. V. Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Sablina, K. A.; Саблина, Клара Александровна; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Vorotynov, A. M.; Воротынов, Александр Михайлович; Volkov, N. V.; Волков, Никита Валентинович; Bovina, A. F.; Бовина, Ася Федоровна
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VERSHININ, V. V.
MAGNETOSTRICTIVE SUSCEPTIBILITY OF THIN-FILM TRANSFORMERS OF SURFACE ACOUSTIC-WAVES / V. V. VERSHININ, A. I. POLSKII // Zhurnal Tek. Fiz. - 1982. - Vol. 52, Is. 2. - P. 356-361. - Cited References: 4 . - ISSN 0044-4642

РУБ Physics, Applied

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Доп.точки доступа:
POLSKII, A. I.
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    Val'kov, V. V.
    The modification of low-temperature magnetic properties of the Fe-based double-zigzag single-chain magnet under irradiation / V. V. Val'kov, M. S. Shustin // J. Magn. Magn. Mater. - 2017. - Vol. 440. - P. 19-22, DOI 10.1016/j.jmmm.2016.12.100. - Cited References: 14. - This study was supported by the Presidium of the Russian Academy of Sciences, program Actual problems of low temperature physics (project 0358-2015-0005); the Russian Foundation for Basic Research, projects nos. 16-42-243057 (partly with Government of Krasnoyarsk Territory) and 15-42-04372; Technology Support Fund to the research project nos. 14/16. The work of M.S.S. was supported by grant of the President of the Russian Federation (project MK-1398.2017.2). . - ISSN 0304-8853
   Перевод заглавия: Модификация низкотемпературных свойств железо содержащего одноцепочечного магнетика с магнитной топологией двойного зигзага

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SPIN-CROSSOVER
MODEL
Кл.слова (ненормированные):
Single-chain magnets -- Light-induced spin crossover -- Magnetic susceptibility -- Quantum phase transitions
Аннотация: An exact solution for a generalized Ising model describing single-chain magnet {[FeIII(Tp*)(CN)3]2FeII(bpmh)}·2H2O with alternating high-spin and low-spin iron ions and double-zigzag magnetic topology has been calculated making use of the transfer-matrix technique. The introduction of a statistical ensemble taking into account the presence of iron ions with high-spin (HS) and low-spin (LS) states made it possible to describe the modification of magnetic susceptibility under optical irradiation. It has been shown that joint implementation of iron ions with photoinduced magnetic states and non-magnetic intersite repulsion ions of these states is caused by the difference of the ionic radii of HSFeIIHSFeII and LSFeIILSFeII leads to the quantum phase transitions in the system.

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Доп.точки доступа:
Shustin, M. S.; Шустин, Максим Сергеевич; Вальков, Валерий Владимирович; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН
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Val'kov, V. V.
Radiation-induced modification of the temperature dependence of the magnetic susceptibility of a 1D magnet / V. V. Val'kov, M. S. Shustin // JETP Letters. - 2014. - Vol. 100, Is. 7. - P. 455-462, DOI 10.1134/S0021364014190138. - Cited References: 28. - This work was supported by the Russian Foundation for Basic Research, project nos. 12-02-31130, 13-02-00523, and 13-02-98013. . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
SINGLE-CHAIN MAGNETS
   EASY-PLANE
   ARRANGEMENT
   MODEL
   IONS
Аннотация: TThe excitation spectrum of a catena-[FeII(ClO4)2{FeIII(bpca)2}]ClO4 anisotropic 1D magnet with alternating high-spin and low-spin iron ions has been calculated with the use of the diagrammatic technique for Hubbard operators. This has allowed establishing conformity with the Ising model, for which the magnetic susceptibility has been calculated by the transfer-matrix method. The introduction of a statistical ensemble taking into account the presence of chains with different lengths and iron ions with different spins has allowed describing the modification of the magnetic susceptibility under optical irradiation.

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Публикация на русском языке Вальков, Валерий Владимирович. Модификация температурной зависимости магнитной восприимчивости 1D-магнетика под действием облучения [Текст] / В. В. Вальков, М. С. Шустин // Письма в Журн. эксперим. и теор. физ. : Наука, 2014. - Т. 100 Вып. 7. - С. 510-517

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

Доп.точки доступа:
Shustin, M. S.; Шустин, Максим Сергеевич; Вальков, Валерий Владимирович; Russian Foundation for Basic Research [12-02-31130, 13-02-00523, 13-02-98013]
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Val'kov, V. V.
Quantum renormalizations in anisotropic multisublattice magnets and the modification of magnetic susceptibility under irradiation / V. V. Val'kov, M. S. Shustin // J. Exp. Theor. Phys. - 2015. - Vol. 121, Is. 5. - P. 860-877, DOI 10.1134/S1063776115110175. - Cited References:46. - This work was supported by the Russian Foundation for Basic Research, project nos. 13-02-00523, 14-02-31237, and 15-42-04372 . - ISSN 1063-7761. - ISSN 1090-6509

РУБ Physics, Multidisciplinary
Рубрики:
SINGLE-CHAIN MAGNETS
   GLAUBER MODEL
   EASY-PLANE
   ARRANGEMENT
   SYSTEMS
   IONS
Аннотация: The dispersion equation of a strongly anisotropic one-dimensional magnet catena-[FeII(ClO4)2{FeIII(bpca)2}]ClO4 containing alternating high-spin (HS) (S = 2) and low-spin (LS) (S = 1/2) iron ions is obtained by the diagram technique for Hubbard operators. The analysis of this equation yields six branches in the excitation spectrum of this magnet. It is important that the crystal field for ions with spin S = 2 is described by the Hamiltonian of single-ion easy-plane anisotropy, whose orientation is changed by 90° when passing from one HS iron ion to another. The U(N) transformation technique in the atomic representation is applied to diagonalize a single-ion Hamiltonian with a large number of levels. It is shown that the modulation of the orientation of easy magnetization planes leads to a model of a ferrimagnet with easy-axis anisotropy and to the formation of energy spectrum with a large gap. For HS iron ions, a decrease in the mean value of the spin projection due to quantum fluctuations is calculated. The analysis of the specific features of the spectrum of elementary excitations allows one to establish a correspondence to a generalized Ising model for which the magnetic susceptibility is calculated in a wide range of temperatures by the transfer-matrix method. The introduction of a statistical ensemble that takes into account the presence of chains of different lengths and the presence of iron ions with different spins allows one to describe the experimentally observed modification of the magnetic susceptibility of the magnet under optical irradiation.

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Публикация на русском языке Вальков, Валерий Владимирович. Квантовые ренормировки в анизотропных многоподрешеточных магнетиках и модификация магнитной восприимчивости при облучении [Текст] / В. В. Вальков, М. С. Шустин // Журнал экспериментальной и теоретической физики : Наука, 2015. - Т. 148 Вып. 5. - С. 984-1004

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

Доп.точки доступа:
Shustin, M. S.; Шустин, Максим Сергеевич; Вальков, Валерий Владимирович; Russian Foundation for Basic Research [13-02-00523, 14-02-31237, 15-42-04372]
}
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10.

Val'kov, V. V.
Manifestation of spin-charge fluctuations in the spectral and thermodynamic properties of quasi-two-dimensional rare-earth intermetallic compounds / V. V. Val'kov, A. O. Zlotnikov // Low Temp. Phys. - 2017. - Vol. 43, Is. 2. - P. 191-199, DOI 10.1063/1.4977211. - Cited References:35. - This work was supported by RFBR (Grants Nos. 16-02-00073-a and 15-42-04372-r-Siberia-a), the Government of the Krasnoyarsk Region and the Regional Science Foundation (Ext. Agreement No. 07/16), as well as the Integrated program II.2P of SB RAS (Project No. 0358-2015-0002). One of the authors (A.O.Z.) acknowledges the support by the Presidential scholarships for young PhDs (SP-1370.2015.5). . - ISSN 1063-777X. - ISSN 1090-6517

РУБ Physics, Applied
Рубрики:
PERIODIC ANDERSON MODEL
   INTERMEDIATE-VALENCE COMPOUNDS
   MAGNETIC PHASE-DIAGRAM
   HEAVY
   SUSCEPTIBILITY
   APPROXIMATION
   ANTIFERROMAGNETISM
   SUPERCONDUCTIVITY
   LATTICE
   METALS
Аннотация: In the framework of the modified periodic Anderson model with exchange interaction in the subsystem of localized states, it is shown that spin-charge fluctuations in quasi-two-dimensional intermetallic compounds with rare-earth ions in the mixed valence state significantly affect both the spectrum of magnetic excitations and the conditions at which the antiferromagnetic phase is realized. The spectral characteristics of the phase were obtained by the method of the diagram technique for Hubbard operators in the one-loop approximation, which allows to account for the spincharge fluctuation contributions to the components of the mass and the force operators. The developed theory allowed to quantitatively describe the pressure dependence of the Neel temperature observed in a quasi-two-dimensional antiferromagnetic heavy-fermion intermetallic compound CeRhIn5. Published by AIP Publishing.

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Публикация на русском языке Вальков, Валерий Владимирович. Проявление спин-зарядовых флуктуаций в спектральных и термодинамических свойствах квазидвумерных редкоземельных интерметаллидов [Текст] / В. В. Вальков, A. O. Злотников // Физ. низк. температур : Физико-технический институт низких температур им. Б. И. Веркина НАН Украины, 2017. - Т. 43 Вып. 2. - С. 233-244

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Вальков, Валерий Владимирович; RFBR [16-02-00073-a, 15-42-04372-r-Siberia-a]; Government of the Krasnoyarsk Region; Regional Science Foundation [07/16]; Integrated program II.2P of SB RAS [0358-2015-0002]; Presidential scholarships for young PhDs [SP-1370.2015.5]
}
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11.

Val'kov, V. V.
Kinematic mechanism of the modulation of the spectral intensity in the spatially uniform system of Hubbard fermions / V. V. Val'kov, A. A. Golovnya, M. M. Korovushkin // JETP Letters. - 2011. - Vol. 94, Is. 3. - P. 197-201, DOI 10.1134/S0021364011150148. - Cited References: 21. - We are grateful to R.O. Zaitsev and N.M. Plakida for the constructive criticism and helpful discussions. This work was supported by the Presidium of the Russian Academy of Sciences (program "Quantum Physics of Condensed Matter"), the Russian Foundation for Basic Research (project no. 09-02-00127), the Ministry of Education and Science of the Russian Federation (federal program "Scientific and Pedagogical Personnel of Innovative Russia" for 2009-2013), and the Siberian Branch, the Russian Academy of Sciences (integration project no. 53). The work of A.A.G. and M.M.K. was also supported by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (grant no. MK-1300-2011.2) and by the Siberian Branch, Russian Academy of Sciences (Lavrent'ev Competition). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
SPIN SUSCEPTIBILITY
   ANTIFERROMAGNETS
   DYNAMICS
   CHARGE
   MODEL
Аннотация: Using the exact representation of the Green's function constructed in terms of the Hubbard operators, it has been shown that the kinematic interaction that induces the spin-fluctuation processes in the spatially uniform system of Hubbard fermions leads to significant variations in the spectral intensity A(k, omega) in the Brillouin zone. As a result, the modulation of A(k, omega) appears in the Fermi contour. The sign of the hopping integral within the first coordination sphere is determined by the contour section, where A(k, omega) decreases according to the angle-resolved photoemission spectroscopy data.

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Держатели документа:
[Val'kov, V. V.
Golovnya, A. A.
Korovushkin, M. M.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Val'kov, V. V.
Golovnya, A. A.
Korovushkin, M. M.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Golovnya, A. A.; Головня, Александр Александрович; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Вальков, Валерий Владимирович
}
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12.

Val'kov, V. V.
Effect of intersite repulsion on the correlation functions and thermodynamics of an Ising chain with annealed magnetic disorder / V. V. Val’kov, M. S. Shustin // Bull. Russ. Acad. Sci. Phys. - 2016. - Vol. 80, Is. 11. - P. 1335-1337, DOI 10.3103/S1062873816110290. - Cited References: 6. - This work was supported by the Russian Foundation for Basic Research, project nos. 13-02-00073, 14-02-31237, and 15-42-04372. . - ISSN 1062-8738
Кл.слова (ненормированные):
Chains -- Magnetic susceptibility -- Temperature distribution -- Thermodynamics -- Transfer matrix method -- Correlation function -- Equilibrium behavior -- Equilibrium distributions -- Non-magnetic impurities -- Quantum phase transitions -- Repulsion parameter -- Temperature dependence -- Transfer matrix technique -- Phase transitions
Аннотация: An exact solution for a model describing the equilibrium behavior of an ensemble of Ising chains with nonmagnetic intersite repulsion of nearest neighbors and an equilibrium distribution of nonmagnetic impurities is obtained using the transfer matrix technique. The possibility of exciting quantum phase transitions using the intersite repulsion parameter in a system is demonstrated. Proximity to the critical points of these transitions has a substantial effect on the temperature dependence of a system’s magnetic susceptibility. © 2016, Allerton Press, Inc.

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Публикация на русском языке Вальков, Валерий Владимирович. Влияние эффектов межузельного отталкивания на корреляционные функции и термодинамику изинговской цепочки с отожженным магнитным беспорядком [Текст] / В. В. Вальков, М. С. Шустин // Изв. РАН. Сер. физич. - 2016. - Т. 80 № 11. - С. 1504-1506

Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Shustin, M. S.; Шустин, Максим Сергеевич; Вальков, Валерий Владимирович
}
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13.

Val'kov, V. V.
Dynamicalmagnetic susceptibility in the spin-fermion model for cuprate superconductors / V. V. Val'kov, D. M. Dzebisashvili // Theor. Math. Phys. - 2017. - Vol. 193, Is. 3. - P. 1853-1864, DOI 10.1134/S004057791712011X. - Cited References:35. - This research was supported by the Russian Foundation for Basic Research (Grant No. 16-02-00073), the Administration of Krasnoyarsk Kray and the Krasnoyarsk Kray Foundation for Scientific and Technical Progress (Grant No. 16-42-240435), and the complex program No. II.2P of the Siberian Branch of the Russian Academy of Sciences (Grant No. 0356-2015-0405). . - ISSN 0040-5779. - ISSN 1573-9333

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
T-J MODEL
   LONG-RANGE-ORDER
   POLARON
   CUO2
   EXCITATIONS
   LATTICE
   WAVE
Кл.слова (ненормированные):
high-temperature conductor -- spin-fermion model -- magnetic susceptibility -- spin polaron
Аннотация: Using the method of diagram techniques for the spin and Fermi operators in the framework of the SU(2)-invariant spin-fermion model of the electron structure of the CuO2plane of copper oxides, we obtain an exact representation of the Matsubara Green’s function D⊥(k, iω m ) of the subsystem of localized spins. This representation includes the Larkin mass operator ΣL(k, iω m ) and the strength and polarization operators P(k, iω m ) and Π(k, iω m ). The calculation in the one-loop approximation of the mass and strength operators for the Heisenberg spin system in the quantum spin-liquid state allows writing the Green’s function D⊥(k, iω m ) explicitly and establishing a relation to the result of Shimahara and Takada. An essential point in the developed approach is taking the spin-polaron nature of the Fermi quasiparticles in the spin-fermion model into account in finding the contribution of oxygen holes to the spin response in terms of the polarization operator Π(k, iω m ).

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Публикация на русском языке Вальков, Валерий Владимирович. Динамическая магнитная восприимчивость в спин-фермионной модели купратных сверхпроводников [Текст] / В. В. Вальков, Д. М. Дзебисашвили // Теор. и мат. физика. - 2017. - Т. 193 Вып. 3. - С. 515-529

Держатели документа:
RAS, Siberian Branch, Fed Res Ctr, Kirensky Inst Phys,KSC, Krasnoyarsk, Russia.
Siberian State Aerosp Univ, Krasnoyarsk, Russia.

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Вальков, Валерий Владимирович; Russian Foundation for Basic Research [16-02-00073]; Krasnoyarsk Kray Foundation for Scientific and Technical Progress [16-42-240435]; Siberian Branch of the Russian Academy of Sciences [II.2P, 0356-2015-0405]; Administration of Krasnoyarsk Kray
}
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14.

Val'kov, V. V.
Dynamical magnetic susceptibility of the periodic anderson model in the chaotic phase approximation / V. V. Val'kov, D. M. Dzebisashvili // Theor. Math. Phys. - 2010. - Vol. 164, Is. 2. - P. 1089-1099, DOI 10.1007/s11232-010-0087-2. - Cited References: 17. - This work was supported in part by the the Presidium of the Russian Academy of Sciences (Program "Quantum Physics of Condensed Matter"), the Siberian Branch of the Russian Academy of Sciences (Interdisciplinary Integration Project No. 53), by the Federal Target Program ("Scientific and Scientific-Pedagogical Resources of Innovated Russia in Years 2009-2013"), and the Russian Foundation for Basic Research (Grant No. 10-02-00251). . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
CORRELATED ELECTRON-SYSTEMS
HUBBARD OPERATORS
SUPERCONDUCTIVITY
Кл.слова (ненормированные):
periodic Anderson model -- generalized chaotic phase approximation -- dynamical magnetic susceptibility
Аннотация: Using the diagram technique in the atomic representation in the generalized chaotic phase approximation, we solve the problem of calculating the dynamical magnetic susceptibility of the periodic Anderson model in the strong electron correlation regime. We express the dynamical magnetic susceptibility in terms of four Matsubara Green's functions describing partial contributions, which are calculated based on exact solutions of integral equations.

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Держатели документа:
[Val'kov, V. V.
Dzebisashvili, D. M.] RAS, Siberian Branch, Inst Phys, Krasnoyarsk, Russia
[Val'kov, V. V.
Dzebisashvili, D. M.] Siberia Fed Univ, Krasnoyarsk, Russia
Siberia State Aerocosm Univ, Krasnoyarsk, Russia
ИФ СО РАН

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Вальков, Валерий Владимирович
}
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15.

Unusual magnetic phase transitions in Gd3+ clusters in multicomponent oxide glasses / J. . Kliava [et al.] // J. Supercond. Nov. Magn. - 2007. - Vol. 20, Is. 2. - P. 149-153, DOI 10.1007/s10948-006-0116-4. - Cited References: 7 . - ISSN 1557-1939

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
GADOLINIUM
RESONANCE
Кл.слова (ненормированные):
oxide glasses -- gadolinium -- magnetic clusters -- superparamagnetism -- Gadolinium -- Magnetic clusters -- Oxide glasses -- Superparamagnetism -- Magnetic clusters -- Magnetic phase transitions -- Oxide glasses -- Weiss constant -- Antiferromagnetic materials -- Ferromagnetic materials -- Gadolinium -- Magnetic anisotropy -- Magnetic susceptibility -- Paramagnetic resonance -- Phase transitions -- Positive ions -- Superparamagnetism -- Glass
Аннотация: Magnetic susceptibility, EPR and optical properties have been studied in a glass system {20La(2)O(3) - 22Al(2)O(3) - 23B(2)O(3) - 35(SiO2 + GeO2)} with a part of La2O3 substituted by Gd2O3 in different concentrations. Positive Weiss constants have been found in more heavily doped glasses; two magnetic transitions at 55 and 12 K have been detected and ascribed, respectively, to ferromagnetic and antiferromagnetic clusters of Gd3+ ions. The EPR spectra confirm the clustering at higher Gd contents. At low temperatures the cluster-related resonance indicates an onset of magnetic anisotropy. The clustering, depending on the Gd concentration, correlates with a shift to lower energies of the strong optical absorption band edge.

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Держатели документа:
Univ Bordeaux 1, Cours Liberat 351, CP MOH, UMR 5798, F-33405 Talence, France
RAS, SB, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel
SV Vavilov State Opt Inst, St Petersburg 199034, Russia
ИФ СО РАН
CPMOH, UMR 5798 CNRS-Universite Bordeaux-I, 33405 Talence Cedex, France
L.V. Kirensky Institute of Physics, SB, RAS, Krasnoyarsk 660036, Russian Federation
Bar-Ilan University, Department of Physics, Ramat-Gan 52900, Israel
S.V. Vavilov State Optical Institute, St.-Petersburg 199034, Russian Federation
CPMOH, Universite Bordeaux-I, 351 Cours de la Liberation, 33405 Talence Cedex, France

Доп.точки доступа:
Kliava, J.; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Edelman, I. S.; Эдельман, Ирина Самсоновна; Potseluyko, A. M.; Petrakovskaja, E. A.; Петраковская, Элеонора Анатольевна; Bruckental, I.; Yeshurun, Y.; Zarubina, T.
}
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16.

Transport properties and ferromagnetism of Co(x)Mn(1-x)Ssulfides / S. S. Aplesnin [et al.] // J. Exp. Theor. Phys. - 2008. - Vol. 106, Is. 4. - P. 765-772, DOI 10.1134/S1063776108040158. - Cited References: 39 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
GIANT VOLUME MAGNETOSTRICTION
   COLOSSAL MAGNETORESISTANCE
   MAGNETIC SEMICONDUCTORS
   ELECTRICAL-PROPERTIES
   ROOM-TEMPERATURE
   ALPHA-MNS
   SPINTRONICS
   TRANSITION
   FEXMN1-XS
   FIELDS
Кл.слова (ненормированные):
Coulomb interactions -- Current voltage characteristics -- Electromotive force -- Ferromagnetism -- Magnetic susceptibility -- Magnetization -- Thermoelectricity -- Transport properties -- Charge susceptibility -- External magnetic fields -- Temperature intervals -- Thermoelectromotive force -- Cobalt compounds
Аннотация: We have studied the resistivity and thermoelectromotive force (thermo emf) in a temperature range of T = 80-1000 K, the magnetic susceptibility and magnetization in a temperature range of T= 4.2-300 K at an external magnetic field of up to 70 kOe, and the structural characteristics of CoxMn1 - S-x sulfides (0 <= x <= 0.4). Anomalies in the transport properties of these compounds have been found in the temperature intervals Delta T-1 = 200-270 K and Delta T-2 = 530-670 K and at T-3 similar to T-N. The temperature dependences of the magnetic susceptibility, magnetization, and resistivity, as well as the current-voltage characteristics, exhibit hysteresis. In the domain of magnetic ordering at temperatures below the Neel temperature (TN), the anti ferromagnetic CoxMn1 - xS sulfides possess a spontaneous magnetic moment that is explained using a model of the orbital ordering of electrons in the t(2g) bands. The influence of the cobalt-ion-induced charge ordering on the transport and magnetic properties of sulfides has been studied. The calculated values of the temperatures corresponding to the maxima of charge susceptibility, which are related to a competition between the on-site Coulomb interaction of holes in various subbands and their weak hybridization, agree well with the experimental data.

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Держатели документа:
[Aplesnin, S. S.
Ryabinkina, L. I.
Romanova, O. B.
Velikanov, D. A.
Balaev, A. D.
Balaev, D. A.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Aplesnin, S. S.
Bandurina, O. N.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Yanushkevich, K. I.
Galyas, A. I.
Demidenko, O. F.] Natl Acad Sci, Joint Inst Solid State & Semicond Phys, Minsk 220072, Byelarus
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation
Joint Institute of Solid State and Semiconductor Physics, National Academy of Sciences of Belarus, Minsk 220072, Belarus

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Ryabinkina, L. I.; Рябинкина, Людмила Ивановна; Romanova, O. B.; Романова, Оксана Борисовна; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Balaev, A. D.; Балаев, Александр Дмитриевич; Balaev, D. A.; Балаев, Дмитрий Александрович; Yanushkevich, K. I.; Galyas, A. I.; Demidenko, O. F.; Bandurina, O. N.
}
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17.

Thermodynamic properties of vanadium oxypentafluoride (IV) (NH4)3VOF5 / E. V. Bogdanov, E. I. Pogoreltsev, A. V. Kartashev [et al.] // Phys. Solid State. - 2020. - Vol. 62, Is. 7. - P. 1271-1279, DOI 10.1134/S1063783420070057. - Cited References: 17. - This study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activity, project no. 18-42-243003 “Effect of Deuteration on Orientational Ordering and Phase Transitions in Ammonium Fluorine-Oxygen Vanadates” . - ISSN 1063-7834
Кл.слова (ненормированные):
oxyfluorides -- phase transitions -- specific heat -- birefringence -- thermal expansion -- pressure susceptibility
Аннотация: The (NH4)3VOF5 crystals have been synthesized and their homogeneity and single-phase structure has been established by the X-ray diffraction, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy studies. The investigations of the temperature dependences of specific heat, entropy, strain, and pressure susceptibility show the occurrence of three phase transitions caused by the structural transformations in the (NH4)3VOF5 crystals. The T–p phase diagram shows the temperature limits of stability of the crystalline phases implemented in (NH4)3VOF5. The optical and dielectric studies disclose the ferroelastic nature of the phase transitions. An analysis of the experimental data together with the data on the isostructural (NH4)3VO2F4 crystal makes it possible to distinguish the physical properties of oxyfluorides containing vanadium of different valences (IV and V).

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Публикация на русском языке Термодинамические свойства оксипентафторида ванадия (IV), (NH4)3VOF5 [Текст] / Е. В. Богданов, Е. И. Погорельцев, А. В. Карташев [и др.] // Физ. тверд. тела. - 2020. - Т. 62 Вып. 7. - С. 1123-1131

Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State Agrarian University, Institute of Engineering Systems and Power, Krasnoyarsk, 660049, Russian Federation
Siberian Federal University, Institute of Engineering Physics and Radio Electronics, Krasnoyarsk, 660041, Russian Federation
Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, 690022, Russian Federation

Доп.точки доступа:
Bogdanov, E. V.; Богданов, Евгений Витальевич; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Kartashev, A. V.; Карташев, Андрей Васильевич; Gorev, M. V.; Горев, Михаил Васильевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.
}
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18.

    The superexchange interactions in mixed Co-Fe ludwigite / N. V. Kazak [et al.] // J. Magn. Magn. Mater. - 2011. - Vol. 323, Is. 5. - P. 521-527, DOI 10.1016/j.jmmm.2010.09.057. - Cited Reference Count: 15. - Гранты: This study was supported by the Russian Foundation for Basic Research (Project no. 09-02-00171-a), the Federal Agency for Science and Innovation (Rosnauka) (Project no. MK-5632. 2010.2), Physical Division of the Russian Academy of Science, the program "Strongly Correlated Electrons", project 2.3.1.; The financial support of Spanish MINCYT, MAT08/1077 and Aragonese E-34 project are also acknowledged. - Финансирующая организация: Russian Foundation for Basic Research [09-02-00171-a]; Federal Agency for Science and Innovation (Rosnauka) [MK-5632. 2010.2]; Physical Division of the Russian Academy of Science; "Strongly Correlated Electrons" [2.3.1]; Spanish MINCYT [MAT08/1077]; Aragonese E-34 project . - MAR. - ISSN 0304-8853
Рубрики:
TRANSPORT-PROPERTIES
   SPECTRA
Кл.слова (ненормированные):
ludwigite structure -- magnetic susceptibility -- magnetic frustration -- mott conductivity -- ludwigite structure -- magnetic frustration -- magnetic susceptibility -- mott conductivity -- ac susceptibility -- cation distributions -- crystal data -- crystallographic sites -- electrical resistivity -- iron atoms -- low temperatures -- ludwigite structure -- magnetic behavior -- magnetic frustrations -- magnetic system -- magnetic transitions -- mossbauer -- mossbauer effects -- mott conductivity -- mott hopping -- superexchange energy -- superexchange interaction -- temperature regions -- trivalent iron -- variable range -- cobalt -- electric conductivity -- magnetic susceptibility -- magnetism -- mossbauer spectroscopy -- x ray diffraction -- crystal structure
Аннотация: The crystal structure, cation distribution and exchange interactions in the Co2.25Fe0.75O2BO3 ludwigite have been explored through X-ray diffraction, electrical resistivity, ac-susceptibility and Mossbauer effect measurements. The crystal data have shown that iron atoms occupy the most symmetric crystallographic sites Fe4 and Fe2. The complex magnetic behavior with two magnetic transitions near 70 and 115 K at low temperatures was found. The Mossbauer data have displayed the trivalent iron states only. The values of superexchange energies have been estimated for Co3O2BO3 and Co2.25Fe0.75O2BO3 yielding a significant role of frustrations in the ludwigite magnetic system. Variable range Mott hopping conductivity law was proved to be valid in the wide temperature region, pointing out a localized character of charge carriers rather than collective. (C) 2010 Elsevier B.V. All rights reserved.

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Держатели документа:
RAS, LV Kirensky Phys Inst, SB, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
Krasnoyarsk State Agr Univ, Krasnoyarsk 660049, Russia
Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, Abd Dept Fis Mat Condensada, E-50009 Zaragoza, Spain
Univ Zaragoza, Area Medidas Fis, Serv Instrumentac Cient, E-50009 Zaragoza, Spain

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Bayukov, O. A.; Баюков, Олег Артемьевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Rudenko, V. V.; Руденко, Валерий Васильевич; Ivanova, N. B.; Иванова, Наталья Борисовна; Knyazev, Yu. V.; Князев, Юрий Владимирович; Bartolom, J.; Arauzo, A.
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19.

Temperature behavior of the antiferromagnetic susceptibility of nanoferrihydrite from the measurements of the magnetization curves in fields of up to 250 kOe / D. A. Balaev [et al.] // Phys. Solid State. - 2017. - Vol. 59, Is. 10. - P. 1940-1946, DOI 10.1134/S1063783417100031. - Cited References:45. - This work was supported by the Russian Foundation for Basic Research, the Government of Krasnoyarsk region, the Krasnoyarsk Regional Foundation of Supporting the Scientific and Scientific-Engineering Activity in the framework of the scientific projects nos. 17-42-240138 and 17-43-240527. . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
FERRIHYDRITE NANOPARTICLES
BACTERIAL FERRIHYDRITE
HYSTERESIS
Аннотация: The cross-breeding problem of the temperature dependence of the antiferromagnetic susceptibility of ferrihydrite nanoparticles is considered. Iron ions Fe3+ in ferrihydrite are ordered antiferromagnetically; however, the existence of defects on the surface and in the bulk of nanoparticles induces a noncompensated magnetic moment that leads to a typical superparamagnetic behavior of ensemble of the nanoparticles with a characteristic blocking temperature. In an unblocked state, magnetization curves of such objects are described as a superposition of the Langevin function and the linear-in-field contribution of the antiferromagnetic “core” of the nanoparticles. According to many studies of the magnetization curves performed on ferrihydrite (and related ferritin) nanoparticles in fields to 60 kOe, dependence χAF(T) decreases as temperature increases, which was related before to the superantiferromagnetism effect. As the magnetic field range increases to 250 kOe, the values of χAF obtained from an analysis of the magnetization curves become lower in magnitude; however, the character of the temperature evolution of χAF is changed: now, dependence χAF(T) is an increasing function. The latter is typical for a system of AF particles with random orientation of the crystallographic axes. To correctly determine the antiferromagnetic susceptibility of AF nanoparticles (at least, ferrihydrite) and to search for effects related to the superantiferromagnetism effect, it is necessary to use in experiments the range of magnetic field significantly higher than that the standard value 60 kOe used in most experiments. The study of the temperature evolution of the magnetization curves shows that the observed crossover is due to the existence of small magnetic moments in the samples.

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Публикация на русском языке Температурное поведение антиферромагнитной восприимчивости нано-ферригидрита из измерений кривых намагничивания в полях до 250 kOe [Текст] / Д. А. Балаев [и др.] // Физ. тверд. тела : Наука, 2017. - Т. 59 Вып. 10. - С. 1920-1926

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Akademgorodok 50, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Svobodnyi Pr 79, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Krasnoyarsk Sci Ctr, Siberian Branch, Fed Sci Ctr, Akademgorodok 50, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Popkov, S. I.; Попков, Сергей Иванович; Krasikov, A. A.; Красиков, Александр Александрович; Balaev, A. D.; Балаев, Александр Дмитриевич; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Stolyar, S. V.; Столяр, Сергей Викторович; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Ladygina, V. P.; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Russian Foundation for Basic Research; Government of Krasnoyarsk region; Krasnoyarsk Regional Foundation of Supporting the Scientific and Scientific-Engineering Activity in the framework of the scientific projects [17-42-240138, 17-43-240527]
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20.

    Structural and magnetic alteration of Cu2GaBO5 forced by Mn3+ doping / E. Moshkina, E. Eremin, D. Velikanov [et al.] // J. Alloy. Compd. - 2022. - Vol. 902. - Ст. 163822, DOI 10.1016/j.jallcom.2022.163822. - Cited References: 43. - The study was supported by the Russian Science Foundation (Grant No. 21-72-00130) . The specific heat measurements were supported by the subsidy allocated to Kazan Federal University for the state assignment in the sphere of scientific activities (Project No.Journal of Alloys and Compounds 902 (2022) 163822 0671-2020-0 050) . The magnetic measurements, powder X-ray and EDX data were obtained using the analytical equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS". The X-ray single-crystal experiment was done using the equipment of the Research and Education Centre "Molecular Design and Environmentally Safe Technologies" at NSU. The authors acknowl-edge Prof. Rushana Eremina and Dr. Tatyana Gavrilova for the valu-able discussion of the obtained results . - ISSN 0925-8388. - ISSN 1873-4669
   Перевод заглавия: Структурная и магнитная перестройка Cu2GaBO5, вызванная допированием Mn3+

РУБ Chemistry, Physical + Materials Science, Multidisciplinary + Metallurgy & Metallurgical
Рубрики:
CRYSTAL-STRUCTURE
SUSCEPTIBILITY
Кл.слова (ненормированные):
Ludwigites -- Flux growth -- Magnetic susceptibility -- Spin glass state
Аннотация: To study the gradual change of the structure and the magnetic state of the ludwigite Cu2GaBO5 upon Mn3+ doping, single crystals of Cu2Ga1−xMnxBO5 (x = 0.55, 0.7, 0.8) with the size up to 3 × 3 × 10 mm3 were grown using the flux technique. The phase homogeneity and crystal structure of the obtained compounds were investigated by the powder and single crystal X-ray diffraction. All the samples possessed the monoclinic-distorted ludwigite structure with the P21/c space group. The study of the actual Cu/Ga/Mn composition by the EDX (energy-dispersive X-ray spectroscopy) technique revealed the lower Mn content in all the samples and the refined formulas were Cu2Ga0.47Mn0.53BO5, Cu1.92Ga0.5Mn0.58BO5 and Cu2Ga0.32Mn0.68BO5, respectively. Despite the high manganese content, the concentration transition (from Cu2GaBO5 to Cu2MnBO5) and change of the monoclinic angle did not occur, but strong Me-O octahedra distortions exceeding those both in the parent ludwigites Cu2GaBO5 and Cu2MnBO5 were found. The study of the thermodynamic and magnetic properties revealed the low-temperature magnetic phase transition inherited from the parent Cu2GaBO5 in all the samples. However, the nature and ordering type for the compounds with different Mn content were different: there was a complex transformation of the magnetic state from the partially ordered AFM (antiferromagnetically) in Cu2Ga0.47Mn0.53BO5, through the spin glass state, to the combined spin glass/ordered state in Cu2Ga0.32Mn0.68BO5 with the appearance of magnetic anisotropy. The evident dependence of Tc (phase transition temperature) on the magnetic field was found as well as its decrease at the nonzero magnetic field in the samples with x = 0.53 and 0.68.

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Держатели документа:
Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
Novosibirsk State Univ, Novosibirsk 630090, Russia.
Inst Geol & Mineral, Novosibirsk 630090, Russia.
Kazan Fed Univ, Inst Phys, Kazan 420008, Russia.
Russian Acad Sci, Fed Res Ctr, Krasnoyarsk Sci Ctr, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Moshkina, E. M.; Мошкина, Евгения Михайловна; Eremin, E. V.; Еремин, Евгений Владимирович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Bovina, A. F.; Бовина, Ася Федоровна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Seryotkin, Y.; Cherosov, M.; Batulin, R.; Nemtsev, I. V.; Немцев, Иван Васильевич; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Russian Science FoundationRussian Science Foundation (RSF) [21-72-00130]; Kazan Federal University [0671-2020-0 050]
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