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Magnetic properties of copper-based ludwigites / R. M. Eremina [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. 1. - Ст. C.P5. - P. 281. - Cited References: 1. - This work supported by the RFBR grant 17-02-00953 . - ISBN 978-5-9500855-7-4

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, Kazan, Russia
Kazan (Volga Region) Federal University, Kazan, Russia
Department of Crystallography, Institute of Earth Sciences, St. Petersburg State University, St. Petersburg, 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; Eremina, R. M.; Gavrilova, T. P.; Gilmutdinov, I. F.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Gurzhiy, V. V.; 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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Investigation of the Magnetic Properties of Ludwigites / R. M. Eremina [et al.] // Bull. Russ. Acad. Sci. Phys. - 2019. - Vol. 83, Is. 7. - P. 912-914, DOI 10.3103/S1062873819070141. - Cited References: 6. - This work was supported by the Russian Foundation for Basic Research, project no. 17-02-00953. . - ISSN 1062-8738
Кл.слова (ненормированные):
Aluminum compounds -- Copper compounds -- Gallium compounds -- Magnetic susceptibility -- Metal ions -- Single crystals -- Temperature distribution -- X ray powder diffraction
Аннотация: Single crystals of Cu2AlBO5 and Cu2GaBO5 copper oxyborates are synthesized via solution-melt crystallization and subjected to X-ray diffraction analysis. Parameters of the crystal lattice and the positions of atoms in a unit cell are determined. Copper ions form a structural chain along axis а in Cu2AlBO5 and Cu2GaBO5. Temperature dependences of the magnetic susceptibility are measured. The obtained curves feature kinks at Т = 2.4 (Cu2AlBO5) and 4.1 K (Cu2GaBO5). © 2019, Allerton Press, Inc.

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Публикация на русском языке Исследование магнитных свойств людвигитов [Текст] / Р. М. Еремина [и др.] // Изв. РАН. Сер. физич. - 2019. - Т. 83 № 7. - С. 999-1002

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.; Gilmutdinov, I. F.; Sofronova, S. N.; Софронова, Светлана Николаевна; Kiiamov, A. G.
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    Destruction of long-range magnetic order in an external magnetic field and the associated spin dynamics in Cu2GaBO5 and Cu2AlBO5 ludwigites / A. A. Kulbakov, R. Sarkar, O. Janson [et al.] // Phys. Rev. B. - 2021. - Vol. 103, Is. 2. - Ст. 024447, DOI 10.1103/PhysRevB.103.024447. - Cited References: 46. - We thank U. Nitzsche for technical assistance. This project was funded in part by the German Research Foundation (DFG) under Grant IN 209/9-1, via Project C03 of the Collaborative Research Center SFB 1143 (project-id 247310070) at the TU Dresden, and the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter—ct.qmat (EXC 2147, project-id 390858490). O.J. was supported by the Leibniz Association through the Leibniz Competition . - ISSN 2469-9950
   Перевод заглавия: Разрушение дальнего магнитного порядка во внешнем магнитном поле и связанная с ним спиновая динамика в людвигитах Cu2GaBO5 и Cu2AlBO5
Кл.слова (ненормированные):
Aluminum compounds -- Antiferromagnetic materials -- Antiferromagnetism -- Band structure -- Copper compounds -- Crystal structure -- Density functional theory -- Gallium compounds -- Magnetic fields -- Neutron diffraction -- Neutron scattering -- Spin fluctuations -- Spin glass -- Temperature -- Antiferromagnetic exchange -- Antiferromagnetic orderings -- Brillouin zone boundary -- External magnetic field -- Long range magnetic order -- Long-range-ordered state -- Quantum spin systems -- Two-dimensional spin model -- Boron compounds
Аннотация: The quantum spin systems Cu2M′BO5 (M′=Al,Ga) with the ludwigite crystal structure consist of a structurally ordered Cu2+ sublattice in the form of three-leg ladders, interpenetrated by a structurally disordered sublattice with a statistically random site occupation by magnetic Cu2+ and nonmagnetic Ga3+ or Al3+ ions. A microscopic analysis based on density-functional-theory calculations for Cu2GaBO5 reveals a frustrated quasi-two-dimensional spin model featuring five inequivalent antiferromagnetic exchanges. A broad low-temperature 11B nuclear magnetic resonance points to a considerable spin disorder in the system. In zero magnetic field, antiferromagnetic order sets in below TN≈4.1 K and ∼2.4 K for the Ga and Al compounds, respectively. From neutron diffraction, we find that the magnetic propagation vector in Cu2GaBO5 is commensurate and lies on the Brillouin-zone boundary in the (H0L) plane, qm=(0.45,0,−0.7), corresponding to a complex noncollinear long-range ordered structure with a large magnetic unit cell. Muon spin relaxation is monotonic, consisting of a fast static component typical for complex noncollinear spin systems and a slow dynamic component originating from the relaxation on low-energy spin fluctuations. Gapless spin dynamics in the form of a diffuse quasielastic peak is also evidenced by inelastic neutron scattering. Most remarkably, application of a magnetic field above 1 T destroys the static long-range order, which is manifested in the gradual broadening of the magnetic Bragg peaks. We argue that such a crossover from a magnetically long-range ordered state to a spin-glass regime may result from orphan spins on the structurally disordered magnetic sublattice, which are polarized in magnetic field and thus act as a tuning knob for field-controlled magnetic disorder.

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Держатели документа:
Institut fur Festkorper- und Materialphysik, Technische Universitat Dresden, Dresden, 01069, Germany
Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter - Ct.qmat, TU Dresden, Dresden, 01069, Germany
Institute for Theoretical Solid State Physics, IFW Dresden, Dresden, 01069, Germany
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50, Krasnoyarsk, 660036, Russian Federation
Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, CH-5232, Switzerland
Institute for Quantum Phenomena in Novel Materials, Helmholtz-Zentrum Berlin fur Materialen und Energie GmbH, Hahn-Meitner-Platz 1, Berlin, 14109, Germany
Max Planck Institute for Chemical Physics of Solids, Nothnitzer Str. 40, Dresden, 01187, Germany
Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, Sibirsky tract 10/7, Kazan, 420029, Russian Federation
Fakultat Chemie und Lebensmittelchemie, Technische Universitat Dresden, Dresden, 01069, Germany
Julich Center for Neutron Science at MLZ, Forschungszentrum Julich GmbH, Lichtenbergstra?e 1, Garching, 85748, Germany

Доп.точки доступа:
Kulbakov, A. A.; Sarkar, R.; Janson, O.; Dengre, S.; Weinhold, T.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Portnichenko, P. Y.; Luetkens, H.; Yokaichiya, F.; Sukhanov, A. S.; Eremina, R. M.; Schlender, P.; Schneidewind, A.; Klauss, H. -H.; Inosov, D. S.
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    Structure, magnetic and thermodynamic properties of heterometallic ludwigites: Cu2GaBO5 and Cu2AlBO5 / R. M. Eremina, T. P. Gavrilova, E. M. Moshkina [et al.] // J. Magn. Magn. Mater. - 2020. - Vol. 515. - Ст. 167262, DOI 10.1016/j.jmmm.2020.167262. - Cited References: 42. - The reported study was supported by the Russian Foundation for Basic Research (RFBR), grant No 17-02-00953. T.P.G., R.M.E. acknowledge the financial support from the government assignment for FRC Kazan Scientific Center of RAS. D.S.I. acknowledges funding from the German Research Foundation through the Collaborative Research Center SFB 1143 in Dresden (project C03) and the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter – ct.qmat (EXC 2147, project-id 39085490). The XRD and EDX measurements have been performed at the X-ray Diffraction Centre and Centre for Microscopy and Microanalysis of the St. Petersburg State University. The magnetometer studies were performed by the subsidy allocated to Kazan Federal University for the state assignment in the sphere of scientific activities (Project No. 0671-2020-0050) . - ISSN 0304-8853
   Перевод заглавия: Структура, магнитные и термодинамические свойства гетерометаллических людвигитов: Cu2GaBO5 и Cu2AlBO5
Кл.слова (ненормированные):
Crystal structure -- Ludwigite -- Quasi-one-dimensional magnetism -- Antiferromagnetic order -- Specific heat -- Magnetization
Аннотация: +We present an extensive study of the structural, magnetic and thermodynamic properties of high-quality monocrystals of two heterometallic oxyborates from the ludwigite family: Cu2GaBO5 and Cu2AlBO5 in the temperature range above 2 K. The distinctive feature of the investigated structures is the selective distribution of Cu and Ga/Al cations. The unit cell of Cu2GaBO5 and Cu2AlBO5 contains four nonequivalent crystallographic sites of metal ions. Two sites in the structure of Cu2GaBO5 are fully occupied by Cu atoms which form the quasi one-dimensional chains along the a-axis. For Cu2AlBO5 all sites are partially occupied by Al and Cu atoms. The joint analysis of low-temperature data on magnetic susceptibility and magnetic contribution to the specific heat showed that Cu2AlBO5 and Cu2GaBO5 exhibit an antiferromagnetic transition at TN=2.4 and 4.1 K, respectively. The magnetic response below TN can be represented as the sum of two contributions: the ordered component and the paramagnetic contribution from defects of the same relative weight. It is shown that the external magnetic field above 2.5 T and 2.8 T for Cu2GaBO5 and Cu2AlBO5, respectively, leads to a broadening of the magnetic phase transition indicating suppression of the long-range antiferromagnetic order.

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Держатели документа:
Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, Sibirsky tract, 10/7, Kazan, 420029, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Physics, Kazan Federal University, Kazan, 420008, Russian Federation
Department of Crystallography, Institute of Earth Sciences, St. Petersburg State University, University Emb. 7/9, St. Petersburg, 199034, Russian Federation
Leibniz Institute for Solid State and Materials Research, IFW Dresden, Dresden, 01069, Germany
Institute for Solid State and Materials Physics, TU Dresden, Dresden, 01069, Germany

Доп.точки доступа:
Eremina, R. M.; Gavrilova, T. P.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Gilmutdinov, I. F.; Batulin, R. G.; Gurzhiy, V. V.; Grinenko, V.; Inosov, D. S.
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    Magnetic properties of copper-based ludwigites / T. Gavrilova [и др.] // Internnational conference "Spin physics, spin chemistry, and spin technology" : Book of abstracts. - Novosibirsk, 2018. - P. 94. - Cited References: 1. - This work was supported by the RFBR no 17-02-00953
   Перевод заглавия: Магнитные свойства медь-содержащих людвигитов

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Доп.точки доступа:
Gavrilova, T.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Gilmutdinov, I. F.; Kiiamov, Airat ; Yatsyk, Ivan; Eremina, R. M.; "Spin physics, spin chemistry, and spin technology", Internnational conference(3 ; 2018 ; Sept. ; 10-15 ; Novosibirsk); Институт органической химии им. Н.Н. Ворожцова Сибирского отделения РАН; Институт физики полупроводников им. А.В. Ржанова Сибирского отделения РАН; Институт химической кинетики и горения им. В.В. Воеводского Сибирского отделения РАН; Международный томографический центр Сибирского отделения РАН; Новосибирский государственный университет
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    Transformation of structure and magnetic properties of Cu2MnBO5 under partial Mn3+ → Fe3+ substitution / E. M. Moshkina [et al.] // J. Magn. Magn. Mater. - 2018. - Vol. 464. - P. 1-10, DOI 10.1016/j.jmmm.2018.05.021. - Cited References: 25. - 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. X-ray diffraction experiment was carried out at the Centre on Molecular Design and Ecologically Safe Technologies at the Novosibirsk State University. The work of one of the coauthors (M.S.P.) was supported by the Russian Foundation for Basic Research (project no. 16-32-60049) and by the program of Foundation for promoting the development of small enterprises in scientific and technical sphere (“UMNIK” program). . - ISSN 0304-8853
   Перевод заглавия: Трансформация структуры и магнитных свойств Cu2MnBO5 при частичном замещении Mn3+ → Fe3+
Кл.слова (ненормированные):
Ludwigites -- Crystal growth -- Ferrimagnets -- Quasi-low-dimensional structure -- Magnetic phase transitions
Аннотация: Single crystals of Fe-substituted Cu2Mn1-xFexBO5 ludwigites have been synthesized using flux technique (x = 0.2, 0.4, 0.5 – in the initial flux system). Structural properties of the synthesized compounds were studied by the single crystal and powder X-ray diffraction analysis. Obtained results were analyzed in the relationship with parent compound Cu2MnBO5. It was revealed that the type of monoclinic distortions of Fe-substituted ludwigites is different from the structure of Cu2MnBO5. The real cation composition and local structure of Cu2Mn1-xFexBO5 ludwigites were studied using XANES and EXAFS techniques, respectively. Analysis of field and thermal dependencies of magnetization showed a high dependence of the magnetic properties of these ludwigites on x with changing the type of magnetic ordering.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian State University of Science and Technologies, Krasnoyarsk, Russian Federation
V.S. Sobolev Institute of Geology and Mineralogy, SB RAS, Novosibirsk, Russian Federation
Novosibirsk State University, Novosibirsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Moshkina, E. M.; Мошкина, Евгения Михайловна; Platunov, M. S.; Платунов, Михаил Сергеевич; Seryotkin, Y. V.; Bovina, A. F.; Бовина, Ася Федоровна; Eremin, E. V.; Еремин, Евгений Владимирович; Sofronova, S. N.; Софронова, Светлана Николаевна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
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Dependence of the structural and magnetic properties of the ludwigites Cu2Mn1-xFexBO5 on the iron content / E. M. Moshkina [et al.] // Moscow International Symposium on Magnetism (MISM-2017) : 1-7 July 2017 : book of abstracts. - 2017. - Ст. 4PO-I1-39. - P. 894

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Доп.точки доступа:
Moshkina, E. M.; Мошкина, Евгения Михайловна; Platunov, M. S.; Платунов, Михаил Сергеевич; Seryotkin, Yu. V.; Bovina, A. F.; Бовина, Ася Федоровна; Eremin, E. V.; Еремин, Евгений Владимирович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
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Effect of magnetic frustrations on magnetism of the Fe3BO5 and Co3BO5 ludwigites / Y. V. Knyazev [et al.] // J. Magn. Magn. Mater. - 2019. - Vol. 474. - P. 493-500, DOI 10.1016/j.jmmm.2018.10.126. - Cited References: 33. - The Russian Foundation for Basic Research, Russia (project no. 17-02-00826-a ). S.G.O. thanks the Russian Academy of Science , Russia (project no. 0356-2017-0030 ) for financial support. J.B. and A.A. acknowledge the financial support of the Spanish MINECO-MAT2017-83468R project, Aragonese E-12 17R RASMIA (co-funded by Fondo Social Europeo), and the European Union (FEDER (ES)). . - ISSN 0304-8853
Кл.слова (ненормированные):
Antiferromagnetics -- Superexchange interactions -- Frustrations
Аннотация: The magnetic structures of Fe3BO5 and Co3BO5 ludwigites have been studied experimentally by magnetic measurements and theoretically by the combination of the group theoretical analysis and semi empiric calculations of the superexchange interactions. The different collinear spin configurations in the triads 3-1-3 and 4-2-4 including ferromagnetic, antiferromagnetic and dimer have been considered. For Fe3BO5 the antiferromagnetic state with zero magnetic moment per unit cell, showing the lowest energy, results to be the most probable magnetic ground state. The unusual magnetic structure comprising two virtually independent orthogonal subsystems is formed to avoid heavy frustrations of superexchange interactions between the 3-1-3 and 4-2-4 spin ladders. In Co3BO5 the magnetic frustrations present for the Co3+ high-spin state are quenched for a Co3+ low spin state resulting in the ferrimagnetic long-range order. The obtained results are discussed in comparison with experimental magnetic data.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian State University of Science and Technologies, Krasnoyarsk, 660014, Russian Federation
Instituto de Ciencia de Materiales de Aragon, CSIC-Universidad de Zaragoza and Departamento de Fisica de la Materia Condensada, Zaragoza, 50009, Spain
Servicio de Medidas Fisicas, Universidad de Zaragoza, Pedro Cerbuna 12, Zaragoza, 50009, Spain

Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Kazak, N. V.; Казак, Наталья Валерьевна; Nazarenko, I. I.; Назаренко, Илья Иванович; Sofronova, S. N.; Софронова, Светлана Николаевна; Rostovtsev, N. D.; Bartolome, J.; Arauzo, A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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    Crystal growth, magnetic properties and analysis of possible magnetic ordering of Ni5Sn(BO5)2 with ludwigite structure / S. Sofronova [et al.] // Phys. Status Solidi B. - 2018. - Vol. 255, Is. 12. - Ст. 1800281, DOI 10.1002/pssb.201800281. - Cited References: 15 . - ISSN 0370-1972
   Перевод заглавия: Рост, магнитные свойства и анализ возможных магнитных структур кристалла Ni5Sn(BO5)2 со структурой людвигита
Кл.слова (ненормированные):
ferrimagnets -- ludwigites -- magnetic phase transitions -- quasi-low-dimensional structures
Аннотация: The ludwigite Ni5Sn(BO5)2 belongs to a family of oxyborates, and has an ordered distribution of nonmagnetic Sn ions. This material is studied here using magnetic measurements. Ni5Sn(BO5)2 does not show full long-range magnetic order, but exhibits a partial ordering at 73 K. A theoretical group analysis is performed and different models of the magnetic structure of Ni5Sn(BO5)2 are discussed.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian State University of Science and Technologies, Krasnoyarsk, 660014, Russian Federation

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Eremin, E. V.; Еремин, Евгений Владимирович; Chernyshov, A.; Bovina, A. F.; Бовина, Ася Федоровна
}
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10.

Magnetic transitions and different valence states of manganese ions in solid solutions (Ni,Cu,Mn)3BO5 / S. N. Sofronova, E. V. Eremin, A. A. Veligzhanin [et al.] // Phys. Solid State. - 2023. - Vol. 65, Is. 2. - P. 260-269, DOI 10.21883/PSS.2023.02.55410.512. - Cited References: 22. - The study was done with financial support from the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and the Krasnoyarsk Regional Fund of Science within scientific project No. 20-42-240011 . - ISSN 1063-7834. - ISSN 1090-6460
Кл.слова (ненормированные):
ludwigites -- magnetic phase transition -- indirect exchange interactions
Аннотация: The content of metal ions and their valence state for three NixCuyMn3–x–yBO5 compositions were estimated by EXAFS and XANES spectroscopy methods. In all three compositions, the copper y content did not exceed 0.25; in the third composition, some manganese ions entered the compound not only in the trivalent, but also in the divalent state. A detailed study of the magnetic properties showed that two magnetic transitions are observed in all compositions: one in the region of 60–75 K, and the second in the region of 10 K. Based on the exchange interactions calculated within the framework of the empirical model, the magnetic ordering temperatures for two- and three-lattice magnets were determined and it was assumed that the magnetic transition in the region of 60–75 K is associated with the ordering of magnetic moments in positions 2 and 3.

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Публикация на русском языке Магнитные переходы и разные валентные состояния ионов марганца в твердых растворах (Ni,Cu,Mn)3BO5 [Текст] / С. Н. Софронова, Е. В. Еремин, А. А. Велигжанин [и др.] // Физ. тверд. тела. - 2023. - Т. 65 Вып. 2. - С. 268-277

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
National Research Center “Kurchatov Institute”, Moscow, Russia

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Eremin, E. V.; Еремин, Евгений Владимирович; Veligzhanin, A. A.; Chernyshov, A. V.; Чернышов, Артем Валерьевич; Kartashev, A. V.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич
}
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11.

Possible noncollinear magnetism and different valence state of manganese ions in quasi-low-dimensional ludwigites of (Ni,Cu,Mn)3BO5 / S. N. Sofronova, A. Veligzhanin, E. Eremin [et al.] // Phys. Status Solidi B. - 2023. - Vol. 260, Is. 5. - Ст. 2200457, DOI 10.1002/pssb.202200457. - Cited References: 30. - The equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” was used for measurements in this research. The authors thank E. Moshkina for providing the samples for the study. - Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activity. Grant Number: 20-42-240011 . - ISSN 0370-1972. - ISSN 1521-3951
Кл.слова (ненормированные):
exchange interactions -- ferrimagnetism -- ludwigites -- noncollinear magnetism
Аннотация: The content of transition-metal ions and their valence state for three compositions of NixCuyMn3−x−yBO5 are estimated by the methods of X-ray absorption spectroscopy. In all the three compositions, the copper content does not exceed 0.25. One of the compositions has manganese ions both in the trivalent and bivalent states according to the K-edge position. The calculations of the total energies of various cation-ordered structures using the software package Wien2K show that copper ions predominately occupy one site, namely, 2(2d). The measurements of the magnetic properties show two types of magnetic transitions in all the three compositions, with one of them being in the range of 60–75 K and the other one at 10 K. Based on the exchange interactions calculated in the framework of the empirical model, magnetic ordering temperatures are estimated for two- and three-sublattice structures and the magnetic transition in the range of 60–75 K is supposed to be connected with magnetic moment ordering in sites 2 and 3.

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Держатели документа:
Kirensky Institute of Physics Federal Research Center KSC SB RAS 660036 Krasnoyarsk, Russia
Kurchatov Specialized Source of Synchrotron Radiation “KISI-Kurchatov” National Research Centre “Kurchatov Institute” 123182 Moscow, Russia

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Veligzhanin, Aleksey; Eremin, E. V.; Еремин, Евгений Владимирович; Chernyshev, A. V.; Чернышов, Артем Валерьевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич
}
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12.

Magnetism and specific heat of ludwigites Mn1.17Co1.83BO5 and Mn1.39Co1.61BO5 / D. V. Popov, T. P. Gavrilova, M. A. Cherosov [et al.] // J. Alloys Compd. - 2024. - Vol. 976. - Ст. 173143, DOI 10.1016/j.jallcom.2023.173143. - Cited References: 34. - This research was supported by the Russian Science Foundation (Project No. 23-72-00047). The work of T.P. Gavrilova and D.V. Popov on the specific heat approximation had the financial support from the government assignment for FRC Kazan Scientific Center of RAS. The work of M.A. Cherosov on the measurements of specific heat has been supported by the Kazan Federal University Strategic Academic Leadership Program (PRIORITY-2030) . - ISSN 0925-8388. - ISSN 1873-4669
Кл.слова (ненормированные):
Magnetically ordered materials -- Ludwigites -- Exchange bias -- Spin glass transition
Аннотация: Mn1.17Co1.83BO5 and Mn1.39Co1.61BO5 ludwigites were synthesized by the flux technique and investigated by means of X-ray diffraction, X-ray fluorescence, DC and AC magnetic susceptibility, and specific heat analysis. The crystal structure of both ludwigites belongs to the Pbam space group with a = 9.25 Å, b = 12.41 Å, and c = 3.05 Å for Mn1.17Co1.83BO5 and a = 9.27 Å, b = 12.45 Å, and c = 3.05 Å for Mn1.39Co1.61BO5. The simultaneously observed negative values of the Curie-Weiss temperatures and ferromagnetic-type hysteresis loops allow us to assume that the ferrimagnetic ordering is realized in Mn1.39Co1.61BO5 below TF = 60.8 K, while in Mn1.17Co1.83BO5 in addition to the above mentioned experimental facts the frequency dependencies of the real and imaginary parts of the AC magnetization were observed assuming the presence of the canonical spin-glass state below TSG = 44.5 K. The observed difference in coercive forces of M-H curves at low temperatures can be associated with presence of two spin subsystems for Mn1.17Co1.83BO5.

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Держатели документа:
Zavoisky Physical-Technical Institute, FRC KazSC RAS, Sibirsky tract, 10/7, Kazan, 420029, Russian Federation
Institute of Physics, Kazan (Volga Region) Federal University, Kremlevskaya st., 18, Kazan, 420008, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok, 50/38, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Popov, D. V.; Gavrilova, T. P.; Cherosov, M. A.; Shustov, V. A.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Fazlizhanov, I. I.; Eremina, R. M.
}
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13.

Magnetism of ludwigites Mn1.17Co1.83BO5 and Mn1.39Co1.61BO5 / R. M. Eremina, D. V. Popov, R. G. Batulin [et al.] // Book of abstacts of Samarkand International Symposium on Magnetism (SISM-2023) / int. adv. com. S. G. Ovchinnikov [et al.]. - 2023. - Ст. 2PO-L4-5. - P. 102. - Cited References: 1. - РФН № 23-72-00047 . - ISBN 978-5-00202-320-2

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Держатели документа:
Kirensky Institute of Physics SB RAS
Zavoisky Physical-Technical Institute, Federal Research Center
Kazan (Volga Region) Federal University

Доп.точки доступа:
Ovchinnikov, S. G. \int. adv. com.\; Овчинников, Сергей Геннадьевич; Eremina, R. M.; Popov, D. V.; Batulin, R. G.; Cherosov, M. A.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Samarkand International Symposium on Magnetism(2023 ; July 2-6 ; Samarkand); Samarkand State University
}
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14.

Synthesis, structural and magnetic properties of ludwigite Mn1.32Ni0.85Cu0.83BO5 / S. N. Sofronova, E. V. Eremin, E. M. Moshkina [et al.] // Phys. Solid State. - 2022. - Vol. 64, Is. 11. - P. 1743-1749, DOI 10.21883/PSS.2022.11.54200.425. - Cited References: 19. - The study was done with financial support from the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and the Krasnoyarsk Regional Fund of Science within scientific project No. 20-42-240011. The research was carried out using the equipment provided by the Krasnoyarsk Regional Center for Collective Use . - ISSN 1063-7834. - ISSN 1090-6460
Кл.слова (ненормированные):
ludwigites -- magnetic interface transition -- indirect exchange interactions
Аннотация: Single crystals of Mn1.32Ni0.85Cu0.83BO5 with the ludwigite structure were obtained by the solution-melt method during spontaneous crystallization. The concentration of copper, manganese and nickel ions was determined by transmission microscopy. Manganese ions are included in compounds in the divalent and trivalent states. The study of temperature and field dependences showed that we have several magnetic transitions. The first transition, associated with the ferrimagnetic ordering of the magnetic moments of parts of the ions, observed in the region of 50 K. In the region of 25 K, a second magnetic transition is observed. Substitution of nickel ions for copper and divalent manganese of better disorder and competition of exchange interactions, which leads to the division of the magnetic system into several magnetic subsystems that are ordered at different temperatures.

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Публикация на русском языке Синтез, структурные и магнитные свойства людвигита Mn1.32Ni0.85Cu0.83BO5 [Текст] / С. Н. Софронова, Е. В. Еремин, Е. М. Мошкина [и др.] // Физ. тверд. тела. - 2022. - Т. 64 Вып. 11. - С. 1781-1787

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Russian Academy of Sciences, Krasnoyarsk, Russia

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Eremin, E. V.; Еремин, Евгений Владимирович; Moshkina, E. M.; Мошкина, Евгения Михайловна; Selyanina, A. V.; Селянина, Анна Валентиновна; Bondarenko, G. N.; Shabanov, A. V.; Шабанов, Александр Васильевич
}
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15.

    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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16.

    Influence of Jahn-Teller Cu2+ doping on the structural and magnetic properties of quasi-two-dimensional oxyborate (Ni,Cu)2MnBO5 / A. Kartashev, E. Eremin, E. Moshkina [et al.] // J. Magn. Magn. Mater. - 2022. - Vol. 545. - Ст. 168747, DOI 10.1016/j.jmmm.2021.168747. - Cited References: 23. - This study was carried out on the equipment of the Krasnoyarsk Regional Center for Collective Use, Krasnoyarsk Science Center, Siberian Branch of the Russian Academy of Sciences. This work was supported by the Russian Foundation for Basic Research, Government of the Krasnoyarsk Region, and Krasnoyarsk Regional Foundation for Support of Scientific and R&D Activities, project no. 20-42-240011 . - ISSN 0304-8853
   Перевод заглавия: Влияние ян-теллеровского легирования Cu2+ на структурные и магнитные свойства квазидвумерного оксибората (Ni,Cu)2MnBO5
Кл.слова (ненормированные):
Ferrimagnet -- Frustrated materials -- Low-dimensional system -- Ludwigites
Аннотация: Using the flux technique single crystals of (Ni,Cu)2MnBO5 were grown. The crystal structure of this compound belongs to the space group Pbam(55). There are no monoclinic distortions of the crystal structure. The analysis of the structural data shows that the content of copper ions in the crystal is lower than 10 percent. The magnetic ordering into the ferrimagnetic phase occurs at 75 K. The assessment of the exchange interactions shows that changes in the exchange interactions lead to increasing frustrations in the system which could result in a decrease in the temperature of magnetic ordering.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, 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:
Kartashev, A. V.; Карташев, Андрей Васильевич; Eremin, E. V.; Еремин, Евгений Владимирович; Moshkina, E. M.; Мошкина, Евгения Михайловна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Sofronova, S. N.; Софронова, Светлана Николаевна
}
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17.

Peculiarities and comparison of Cu2MBO5 (M = Fe, Mn, Cr) ludwigites crystallization in Bi2O3-MoO3-Na2O-B2O3 multicomponent fluxes / M. S. Molokeev, A. F. Bovina, K. A. Shabanova [et al.] // VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022) : Book of abstracts / program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 2, Sect. G : Frustrated and disordered magnetism. - Ст. G.P8. - P. 25-26. - Cited References: 6. - The study was supported by the Russian Science Foundation (grant No. 22-12-20019) . - ISBN 978-5-94469-051-7

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

Доп.точки доступа:
Molokeev, M. S.; Молокеев, Максим Сергеевич; Bovina, A. F.; Бовина, Ася Федоровна; Shabanova, K. A.; Kokh, D.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Eremin, E. V.; Еремин, Евгений Владимирович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Moshkina, E. M.; Мошкина, Евгения Михайловна; Российская академия наук; Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН; Казанский (Приволжский) федеральный университет; Euro-Asian Symposium "Trends in MAGnetism"(8 ; 2022 ; Aug. ; 22-26 ; Kazan); "Trends in MAGnetism", Euro-Asian Symposium(8 ; 2022 ; Aug. ; 22-26 ; Kazan)
}
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18.

Multicomponent flux growth and composition control of Cu2MnBO5:Ga ludwigites / E. Moshkina, A. Krylov, D. Kokh [et al.] // CrystEngComm. - 2022. - Vol. 24, Is. 19. - P. 3565-3575, DOI 10.1039/d2ce00258b. - Cited References: 26. - This study was supported by the Russian Science Foundation (Grant No. 21-72-00130). The Raman, X-ray, and EDX data were obtained using the analytical equipment of the Krasnoyarsk Regional Center of Research Equipment of the Federal Research Center “Krasnoyarsk Science Center SB RAS” . - ISSN 1466-8033
Кл.слова (ненормированные):
Bismuth compounds -- Boron compounds -- Copper compounds -- Crystal symmetry -- Energy dispersive spectroscopy -- Gallium -- Manganese oxide -- Positive ions -- Sodium compounds
Аннотация: To reach the concentration phase boundary between antiferromagnetic Cu2GaBO5 and ferrimagnetic Cu2MnBO5 ludwigites, solid solutions Cu2Mn1−xGaxBO5 (x = 0.05, 0.1, 0.15, 0.175) were grown by the flux technique using a multi-component solvent based on Bi2Mo3O12 with the addition of Na2B4O7 which significantly influenced the crystal formation and cation composition of the studied compounds. The content of the flux system was corrected taking into account the earlier established relationship of the partition coefficients of Mn2O3 and Ga2O3. The influence of the solvent components on the ludwigite crystallization was analyzed. The maximum size of the grown crystal was 1 × 1 × 4 mm3. The structure and cation composition of the grown compounds were studied using X-ray (X-ray diffraction, EDX (energy-dispersive X-ray spectroscopy)) and vibrational (Raman) spectroscopy techniques. The phase boundary of Cu2MnBO5–Cu2GaBO5 was found to be in the concentration range of x = 0.15–0.175, corresponding to a change in the monoclinic axis direction and a leap in the lattice parameters. The symmetry evolution of metal–oxygen octahedra for four nonequivalent cation positions was analyzed, and the unique crystal structure of Cu2MnBO5 demonstrated high rigidity relative to the introduction of Ga3+ cations. The polarized Raman spectra of monoclinic ludwigites were obtained and studied for the first time. A comparison of the spectra of the studied samples in both phases and orthorhombic ludwigites was made. A number of spectral features due to the monoclinic distortions in the crystal were found. In agreement with the Raman experiment, the concentration phase boundary was close to 0.15.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian State University of Science and Technologies, Krasnoyarsk, 660037, Russian Federation
Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
St Petersburg University, St Petersburg, 199034, Russian Federation

Доп.точки доступа:
Moshkina, E. M.; Мошкина, Евгения Михайловна; Krylov, A. S.; Крылов, Александр Сергеевич; Kokh, D.; Shabanova, K.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bovina, A. F.; Бовина, Ася Федоровна; Plyaskin, M.; Пляскин, Михаил Е.; Rostovtsev, N.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
}
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19.

    The superexchange interactions and magnetic ordering in low-dimentional ludwigite Ni5GeB2O10 / S. N. Sofronova [et al.] // J. Magn. Magn. Mater. - 2016. - Vol. 401. - P. 217-222, DOI 10.1016/j.jmmm.2015.10.024. - Cited References: 23. - This study was supported by Russian Foundation for Basic Research (RFFI Siberia No. 15-42-04186). We thank S. Popkov, G. Yurkin for help on the magnetic measurements and M.S. Molokeev for help on the x-ray diffraction . - ISSN 0304-8853
   Перевод заглавия: Суперобменные взаимодействия и магнитное упорядочение в низкомерном людвигите Ni5GeB2O10

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
DIELECTRICS
EXCHANGE
CATION
Кл.слова (ненормированные):
Ludwigites -- Magnetic order -- Heat capacity -- Exchange interactions -- Ferrimagnetic
Аннотация: The ludwigite Ni5Ge(BO5)2 belongs to a family of oxyborates which have low-dimensional subunits in the form of three-leg ladders unit structure. This material was studied by magnetic and thermodynamic measurements. Ni5Ge(BO5)2 does not show full long-range magnetic order, but one goes into a partial ordering or spin-glass state at 87 K. The superexchange interactions were calculated in the framework of a simple indirect coupling model. Different models of magnetic structure of Ni5Ge(BO5)2 and its unique magnetic behaviour was discussed. © 2015 Elsevier B.V.

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Держатели документа:
L.V. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Science, Krasnoyarsk, Russian Federation
M.V. Reshetnev Siberian State Aerospace University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Eremin, E. V.; Еремин, Евгений Владимирович; Nazarenko, I. I.; Назаренко, Илья Иванович; Volkov, N. V.; Волков, Никита Валентинович; Kartashev, A. V.; Карташев, Андрей Васильевич; Moshkina, E. M.; Мошкина, Евгения Михайловна
}
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20.

Spin-lattice coupling and peculiarities of magnetic behavior of ferrimagnetic ludwigites Mn0.52+M1.52+Mn3+BO5(M=Cu, Ni) / L. N. Bezmaternykh [et al.] // Solid State Phenom. : Selected, peer reviewed papers. - 2015. - Vol. 233-234: Achievements in Magnetism. - P. 133-136, DOI 10.4028/www.scientific.net/SSP.233-234.133. - Cited References: 7 . - ISSN 1662-9779. - ISSN 978-3-038
Рубрики:
Achievements in magnetism
Кл.слова (ненормированные):
counter magnetization -- spin-lattice coupling -- ludwigites
Аннотация: Temperature-field and orientational magnetization dependences of single crystals were measured. Both samples demonstrate significant field-depending temperature hysteresis and low-temperature counter field magnetization. The correlation of orientational dependences of these effects and magnetic anisotropy is analyzed; the role of spin-lattice interactions is discussed.
Измерены температурно-полевые и ориентационные зависимости намагниченности монокристаллов. Оба образца демонстрируют гистерезис температуры в зависимости от поля и существенную намагниченность, направленную против поля при низкой температуре. Анализируется корреляция ориентационных зависимостей этих эффектов и магнитной анизотропии; Обсуждается роль спин-решеточных взаимодействий.

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Доп.точки доступа:
Perov, N. \ed.\; Semisalova, A. \ed.\; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Moshkina, E. M.; Мошкина, Евгения Михайловна; Eremin, E. V.; Еремин, Евгений Владимирович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Volkov, N. V.; Волков, Никита Валентинович; Seryotkin, Yu. V.; Moscow International Symposium on Magnetism(6 ; 2014 ; June-July ; Moscow)
}
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