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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sofronova S. N., Bezmaternykh L. N., Eremin E. V., Chernyshov A., Bovina A. F.
Заглавие : Crystal growth, magnetic properties and analysis of possible magnetic ordering of Ni5Sn(BO5)2 with ludwigite structure
Место публикации : Phys. Status Solidi B. - 2018. - Vol. 255, Is. 12. - Ст.1800281. - ISSN 03701972 (ISSN), DOI 10.1002/pssb.201800281
Примечания : Cited References: 15
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sofronova S. N., Moshkina E. M., Nazarenko I. I., Seryotkin Yu. V., Nepijko S. A., Ksenofontov V., Medjanik K., Veligzhanin A. A., Bezmaternykh L. N.
Заглавие : Crystal growth, structure, magnetic properties and theoretical exchange interaction calculations of Cu2MnBO5
Место публикации : J. Magn. Magn. Mater.: Elsevier, 2016. - Vol. 420. - P.309-316. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2016.07.019
Примечания : Cited References: 35. - X-ray diffraction experiment was carried out at the Centre on Molecular Design and Ecologically Safe Technologies at the Novosibirsk State University. The reported study was funded by Russian Foundation for Basic Research (RFBR) and Government of Krasnoyarsk Territory according to the research project No. 16-42-243028.
Предметные рубрики: SPIN-GLASS BEHAVIOR
SINGLE-CRYSTALS
SUPEREXCHANGE INTERACTIONS
LUDWIGITE
DIELECTRICS
CO3B2O6NI3B2O6
WARWICKITES
FE3O2BO3
IFEFFIT
NI3B2O6
Ключевые слова (''Своб.индексиров.''): oxyborates--ludwigites--xmcd--exafs--magnetism
Аннотация: Single crystals of ludwigite Cu2MnBO5 were synthesized by flux growth technique. The detailed structural and magnetic characterizations of the synthesized samples have been carried out. The cations composition of the studied crystal was determined using X-ray diffraction and EXAFS technique, the resulting composition differ from the content of the initial Mn2O3–CuO components of the flux. Magnetic susceptibility measurements and the calculations of the exchange integrals in frameworks of indirect coupling model revealed that monoclinic distortions strongly affect exchange interactions and appearance of magnetic ordering phase at the temperature T=93 K. The hypothesis of the existence of several magnetic subsystems was supposed. © 2016 Elsevier B.V.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sofronova S. N., Nazarenko I. I., Veligzhanin A. A., Seryotkin Yu. V.
Заглавие : Crystal structure and exchange interactions of Cu2MnBO5
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016): abstracts/ ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk: KIP RAS SB, 2016. - Ст.P1.27. - P.87. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : References: 4
Ключевые слова (''Своб.индексиров.''): ludwigites--exchange interactions--single crystal--ferrimagnetic
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Moshkina E. M., Platunov M. S., Seryotkin Yu. V., Bovina A. F., Eremin E. V., Bezmaternykh L. N.
Заглавие : Dependence of the structural and magnetic properties of the ludwigites Cu2Mn1-xFexBO5 on the iron content
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации : Moscow International Symposium on Magnetism (MISM-2017): 1-7 July 2017 : book of abstracts. - 2017. - Ст.4PO-I1-39. - P.894 (Шифр 29916280)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kulbakov A. A., Sarkar R., Janson O., Dengre S., Weinhold T., Moshkina E. M., Portnichenko P. Y., Luetkens H., Yokaichiya F., Sukhanov A. S., Eremina R. M., Schlender P., Schneidewind A., Klauss H. -H., Inosov D. S.
Заглавие : Destruction of long-range magnetic order in an external magnetic field and the associated spin dynamics in Cu2GaBO5 and Cu2AlBO5 ludwigites
Место публикации : Phys. Rev. B. - 2021. - Vol. 103, Is. 2. - Ст.024447. - ISSN 24699950 (ISSN), DOI 10.1103/PhysRevB.103.024447
Примечания : 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
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Knyazev Yu. V., Kazak N. V., Nazarenko I. I., Sofronova S. N., Rostovtsev N. D., Bartolome J., Arauzo A., Ovchinnikov S. G.
Заглавие : Effect of magnetic frustrations on magnetism of the Fe3BO5 and Co3BO5 ludwigites
Место публикации : J. Magn. Magn. Mater. - 2019. - Vol. 474. - P.493-500. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2018.10.126
Примечания : 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)).
Ключевые слова (''Своб.индексиров.''): 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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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Bezmaternykh L. N., Kolesnikova E. M., Sofronova S. N., Eremin E. V.
Заглавие : Flux growth and Magnetism of heterovalent Co-Mn ludwigites
Коллективы : Crystallogenesis and Mineralogy, International Conference (3; 2013 ; 27 Sept.-1 Oct. 1; Novosibirsk)
Место публикации : 3 Int. Conf. “Crystallogenesis and Mineralogy": Abstracts. - 2013. - P.67
Аннотация: Определены условия выращивания кристаллов Co-Mn людвигитов. Показана связь магнитных свойств кристалла с его составом.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kartashev A. V., Eremin E. V., Moshkina E. M., Molokeev M. S., Sofronova S. N.
Заглавие : Influence of Jahn-Teller Cu2+ doping on the structural and magnetic properties of quasi-two-dimensional oxyborate (Ni,Cu)2MnBO5
Место публикации : J. Magn. Magn. Mater. - 2022. - Vol. 545. - Ст.168747. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2021.168747
Примечания : 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
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Eremina R. M., Moshkina E. M., Gavrilova T. P., Gilmutdinov I. F., Sofronova S. N., Kiiamov A. G.
Заглавие : Investigation of the Magnetic Properties of Ludwigites
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2019. - Vol. 83, Is. 7. - P.912-914. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873819070141
Примечания : Cited References: 6. - This work was supported by the Russian Foundation for Basic Research, project no. 17-02-00953.
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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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N.V., Ivanova N.B., Rudenko V.V., Vasil'ev A.D., Velikanov D.A., Ovchinnikov S.G.
Заглавие : Low-field magnetization of ludwigites Co3O2BO3 and Co3-x Fe (x) O2BO3 (x a parts per thousand 0.14)
Коллективы : Federal Agency for Science and Innovation [MK-4278.2008.2]
Разночтения заглавия :авие SCOPUS: Low-field magnetization of ludwigites Co3O2BO 3 and Co3 - X Fe x O2BO3 (x ≈ 0.14)
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009. - Vol. 51, Is. 5. - P966-969. - ISSN 1063-7834, DOI 10.1134/S1063783409050138
Примечания : Cited References: 17. - This study was supported by the Branch of General Physics and Astronomy of the Russian Academy of Sciences (program "Strongly Correlated Electrons") and the Federal Agency for Science and Innovation (project no. MK-4278.2008.2).
Предметные рубрики: ELECTRICAL-PROPERTIES
FE3O2BO3
BEHAVIOR
Аннотация: Ludwigite single crystals of compositions Co3O2BO3 and Co3 - x Fe (x) O2BO3 (x a parts per thousand 0.14) have been synthesized. The crystal structure is investigated at room temperature, and the magnetization is studied in the temperature range T = 4.2-100 K in magnetic fields of up to 600 Oe. The orthorhombic symmetry is revealed, and the unit cell parameters are determined. A number of features are established for the temperature dependence of the magnetization. In unsubstituted Co3O2BO3, two magnetic transitions are found at T (C1) = 43 K and T (C2) = 15 K. At temperatures below 40 K, spin-glass state is revealed. Substitution of iron ions for cobalt ions leads to a noticeable shift in the magnetic transitions toward the high-temperature range: T (C1) = 83 K and T (C2) = 74 K. A ferromagnetic ordering of the P type is found in the Co3 - x Fe (x) O2BO3 (x a parts per thousand 0.14) compound.
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