/ 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
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.