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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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Belyaev, B. A.
Electrodynamic calculation of effective electromagnetic parameters of a dielectric medium with metallic nanoparticles of a given size / B. A. Belyaev, V. V. Tyurnev // J. Exp. Theor. Phys. - 2018. - Vol. 127, Is. 4. - P. 608-619, DOI 10.1134/S1063776118100114. - Cited References: 31. - This work was supported by the Ministry of Education and Science of the Russian Federation (contract no. 14.575.21.0142; unique identifier of the project is RFMEFI57517X0142). . - ISSN 1063-7761
Кл.слова (ненормированные):
Electromagnetic fields -- Magnetic susceptibility -- Metals -- Nanoparticles -- Natural frequencies -- Permittivity
Аннотация: The frequency dependence of the effective complex permittivity and effective complex permeability of a heterostructure based on a dielectric medium containing metallic nanoparticles of spherical shape is calculated by an original method. In contrast to the Bruggeman [21] and the Maxwell Garnett [17] approaches, which use the quasi-static approximation in calculations, a nonuniform distribution of electromagnetic fields inside metallic particles is calculated, which allows the analysis of the electromagnetic parameters of the heterostructure not only as a function of frequency but also as a function of the nanoparticle size. It is shown that the plasmon resonant frequency decreases with increasing both the size and the concentration of particles in the heterostructure. It is also shown that a dielectric medium containing nonmagnetic metallic nanoparticles exhibits diamagnetic properties. In this case, the position of the maximum on the frequency dependence of the imaginary part of the magnetic susceptibility coincides with the relaxation frequency of charge carriers. The calculated spectra of the real and imaginary components of the permittivity of the heterostructure with a size of metallic particles less than 10 nm are in good agreement with Bruggeman calculations; however, the agreement with Maxwell Garnett calculations is observed only at nanoparticle concentrations lower than 10–6.

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Публикация на русском языке Беляев, Борис Афанасьевич. Электродинамический расчет эффективных электромагнитных параметров диэлектрической среды с металлическими наночастицами заданных размеров [Текст] / Б. А. Беляев, В. В. Тюрнев // Журн. эксперим. и теор. физ. - 2018. - Т. 154 Вып. 4. - С. 716-729

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

Доп.точки доступа:
Tyurnev, V. V.; Тюрнев, Владимир Вениаминович; Беляев, Борис Афанасьевич
}
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    Numerical calculation of high frequency magnetic susceptibility in thin nanocrystalline magnetic films / A. V. Izotov [et al.] // Physica B. - 2018. - Vol. 556. - P. 42-47, DOI 10.1016/j.physb.2018.12.006. - Cited References: 32. - This work was supported by the Ministry of Education and Science of the Russian Federation, №RFMEFI60417X0179. . - ISSN 0921-4526. - ISSN 1873-2135
   Перевод заглавия: Численный расчет высокочастотной магнитной восприимчивости тонких нанокристаллических магнитных пленок
Рубрики:
Physics, Condensed Matter
Кл.слова (ненормированные):
micromagnetic simulation -- magnetization dynamics -- magnetic susceptibility -- ferromagnetic resonance -- nanocrystalline film -- soft magnetic film
Аннотация: Two numerical micromagnetic methods most suitable for calculation of the high frequency magnetic susceptibility of nanocrystalline thin films were considered in detail. The methods are based on the Landau–Lifshitz equation, linearized around the equilibrium state leading to an eigenvalue problem or solved using an undetermined coefficients technique. An analysis and estimation of an efficiency of the methods were carried out. Several conclusions about their advantages and shortcomings, as well as specifics of their practical application were drawn.

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

Доп.точки доступа:
Izotov, A. V.; Изотов, Андрей Викторович; Belyaev, B. A.; Беляев, Борис Афанасьевич; Solovev, P. N.; Соловьев, Платон Николаевич; Boev, N. M.; Боев, Никита Михайлович
}
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    Magnetic structure of Cu2MnBO5 ludwigite: thermodynamic, magnetic properties and neutron diffraction study / E. Moshkina [et al.] // J. Phys.: Condens. Matter. - 2017. - Vol. 29, Is. 24. - Ст. 245801, DOI 10.1088/1361-648X/aa7020. - Cited References:28. - This study was supported by Russian Foundation for Basic Research (RFBR) and Government of Krasnoyarsk Territory according to the research project No. 16-42-243028. . - ISSN 0953-8984. - ISSN 1361-648X
   Перевод заглавия: Магнитная структура людвигита Cu2MnBO5: исследование термодинамических, магнитных свойств и с помощью метода нейтронной дифракции

РУБ Physics, Condensed Matter
Рубрики:
HEAT
Кл.слова (ненормированные):
neutron diffraction -- magnetic structure -- ludwigites -- ferrimagnets -- magnetic susceptibility -- specific heat
Аннотация: We report on the thermodynamic, magnetic properties and the magnetic structure of ludwigite-type Cu2MnBO5. The specific heat, low-field magnetization and paramagnetic susceptibility were studied on a single crystal and combined with powder neutron diffraction data. The temperature dependence of the specific heat and the neutron diffraction pattern reveal a single magnetic phase transition at T = 92 K, which corresponds to the magnetic ordering into a ferrimagnetic phase. The cation distribution and the values and directions of magnetic moments of ions in different crystallographic sites are established. The magnetic moments of Cu2+ and Mn3+ ions occupying different magnetic sites in the ferrimagnetic phase are pairwise antiparallel and their directions do not coincide with the directions of the principal crystallographic axes. The small value of the magnetic moment of copper ions occupying site 2a is indicative of partial disordering of the magnetic moments on this site. The magnetization measurements show a strong temperature hysteresis of magnetization, which evidences for field-dependent transitions below the phase transition temperature.

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Держатели документа:
RAS, Kirensky Inst Phys, Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia.
Siberian State Aerosp Univ, Krasnoyarsk 660037, Russia.
Inst Max von Laue Paul Langevin, BP 156, F-38042 Grenoble 9, France.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Krasnoyarsk State Pedag Univ, Krasnoyarsk 660049, Russia.

Доп.точки доступа:
Moshkina, E. M.; Мошкина, Евгения Михайловна; Ritter, Clemens; Eremin, E. V.; Еремин, Евгений Владимирович; Sofronova, S. N.; Софронова, Светлана Николаевна; Kartashev, A. V.; Карташев, Андрей Васильевич; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Russian Foundation for Basic Research (RFBR); Government of Krasnoyarsk Territory [16-42-243028]
}
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Ignatchenko, V. A.
Self-consistent approximation: Development and application to the problem of waves in inhomogeneous media / V. A. Ignatchenko, D. S. Polukhin, D. S. Tsikalov // J. Magn. Magn. Mater. - 2017. - Vol. 440: EURO-Asian Symposium on Trends in Magnetism (EASTMAG) (AUG 15-19, 2016, Siberian Fed Univ, Krasnoyarsk, RUSSIA). - P. 83-86, DOI 10.1016/j.jmmm.2016.12.058. - Cited References:20. - This work was supported in part by the Complex Program No II.2P (0356-2015-0410) of the SB of the Russian Academy of Sciences. . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SUPERCONDUCTING CRITICAL-TEMPERATURE
MIGDALS THEOREM
VERTEX FUNCTION
Кл.слова (ненормированные):
Self-consistent approximation -- Greens functions -- Vertex corrections -- Inhomogeneities -- Correlations -- Dynamic susceptibility
Аннотация: A new self-consistent approximation proposed earlier, is compared with various existing approximations, as well as with a numerical simulation of solutions of the wave equation for a medium with one-dimensional inhomogeneities. The Green's function, found using the new approach, is the closest to the result obtained by the numerical simulation. The results of the work show that the new approach has undoubted advantages in the study of stochastic problems in media with longwave inhomogeneities. The new self-consistent approximation in some cases has advantages over a numerical method: a more rapid process of calculation and the possibility of consideration of three-dimensional problems.

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Доп.точки доступа:
Polukhin, D. S.; Полухин, Дмитрий Сергеевич; Tsikalov, D. S.; Цикалов, Денис Сергеевич; Игнатченко, Вальтер Алексеевич; SB of the Russian Academy of Sciences [II.2P (0356-2015-0410)]; 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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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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    Magnetism in spin crossover systems: Short-range order and effects beyond the Heisenberg model / V. I. Kuz'min [et al.] // Phys. Rev. B. - 2019. - Vol. 100, Is. 14. - Ст. 144429, DOI 10.1103/PhysRevB.100.144429. - Cited References: 72. - The authors thank the Russian Scientific Foundation for the financial support under Grant No. 18-12-00022. . - ISSN 2469-9950. - ISSN 2469-9969
   Перевод заглавия: Магнетизм в системах со спиновыми кроссоверами: ближний порядок и эффекты за пределами модели Гейзенберга

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
LOWER-MANTLE
   STATE
   TRANSITION
   PRESSURE
   IRON
   SUSCEPTIBILITY
Аннотация: To study non-Heisenberg effects in the vicinity of spin crossover in strongly correlated electron systems we derive an effective low-energy Hamiltonian for the two-band Kanamori model. It contains a Heisenberg high-spin term proportional to exchange constant as well as a low-spin term proportional to spin gap parameter ɛs. Using cluster mean field theory we obtain several non-Heisenberg effects. Near the critical value of spin gap ɛcs there is a magnetic phase transition of first order. In the vicinity of ɛcs in the paramagnetic phase we observe nontrivial behavior of the Curie constant in the paramagnetic susceptibility in the wide range of temperature. Reentrant temperature behavior of nearest-neighbor spin-spin correlations is observed at ɛsɛcs. Finally, the pressure-temperature magnetic phase diagram for ferroperriclase is obtained using the effective Hamiltonian.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.
Fed Res Ctr KSC SB RAS, Sukhachov Inst Forest, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Kuz'min, V. I.; Кузьмин, Валерий Ипполитович; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Zarubin, A. E.; Ovchinnikova, T. M.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Scientific FoundationRussian Science Foundation (RSF) [18-12-00022]
}
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    Effect of electric field on magnetization and magnetic susceptibility in rare-earth ferroborite multiferroics / A. A. Mukhin [et al.] // 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.O8. - P. 312-313. - Cited References: 3. - This work was supported by the Russian Science Foundation (project 16-12-10531) . - ISBN 978-5-9500855-7-4
   Перевод заглавия: Влияние электрического поляна намагниченность и магнитную восприимчивость редкоземельных мультиферроичных ферроборатов

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Prokhorov General Physics Institute of RAS, Moscow, 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; Mukhin, A. A.; Ivanov, V. Yu.; Tikhanovskii, A. Yu.; Gudim, I. A.; Гудим, Ирина Анатольевна; 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)
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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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10.

Investigation of the Magnetic Properties of Warwickite Mn0.89Mg1.11BO4 / R. M. Eremina [et al.] // Bull. Russ. Acad. Sci. Phys. - 2019. - Vol. 83, Is. 7. - P. 792-794, DOI 10.3103/S106287381907013X. - Cited References: 3. - This work was supported by the Russian Foundation for Basic Research; the Administration of Krasnoyarsk Krai; and the Krasnoyarsk Krai Science Foundation, project no. 18-42-243007. . - ISSN 1062-8738
Кл.слова (ненормированные):
Antiferromagnetism -- Electron spin resonance spectroscopy -- Magnetic susceptibility -- Manganese compounds -- Single crystals -- Temperature distribution
Аннотация: The temperature dependences of the magnetic susceptibility in magnetic fields applied parallel and perpendicular to axis с of a Mn0.89Mg1.11BO4 single crystal were measured. Spin ordering typical of an antiferromagnetic with an easy magnetization axis was observed below 16 K. The Dzyaloshinskii–Moriya interaction between spins of manganese ions in Mn0.89Mg1.11BO4 was estimated by analyzing the EPR linewidth. © 2019, Allerton Press, Inc.

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Публикация на русском языке

Держатели документа:
Zavoisky Physical-Technical Institute, Kazan Scientific Center, Russian Academy of Sciences, Kazan, 420029, Russian Federation
Kazan Federal University, Kazan, 420008, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Eremina, R. M.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Gavrilova, T. P.; Muftakhutdinov, A. R.; Gilmutdinov, I. F.
}
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