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Fizika Tverdogo Tela, 2023 Volume 65, Issue 6, Pages 1054–1059 (Mi ftt10738)

Magnetism

Influence of Ga-substitution to the structural and magnetic properties of (Mn,Fe)$_2$O$_3$ bixbyite

E. M. Moshkinaa, M. S. Molokeevabc, E. V. Ereminabd, L. N. Bezmaternykha

a L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russia
b Siberian Federal University, Krasnoyarsk, Russia
c Far Eastern State Transport University, Khabarovsk, Russia
d M. F. Reshetnev Siberian State University of Science and Technologies, Krasnoyarsk, Russia

Abstract: To study the dependence of the properties of ternary oxides (Mn,Fe,Ga)$_2$O$_3$ with the bixbyite structure on the composition, the temperature dependences of the magnetization and $ac$ magnetic susceptibility of two single-crystal samples of different compositions obtained using the flux method were analyzed. A detailed study of the structure was carried out using single-crystal X-ray diffraction analysis, and the changes in structural parameters depending on the composition were analyzed. The $dc$ magnetization and $ac$ magnetic susceptibility of Fe$_{1.1}$Mn$_{0.76}$Ga$_{0.14}$O$_3$ and Fe$_{0.65}$Mn$_{1.1}$Ga$_{0.26}$O$_3$ bixbyites have been studied. Despite the qualitatively similar behavior of the magnetic properties, significant differences were also found, despite a small difference in the Mn/Fe/Ga ratio in the samples under study. It is shown that both compounds experience two successive low-temperature magnetic phase transitions from the paramagnetic phase at $T$ = 20–32 K as the temperature is lowered. Calculations of the Mydosh parameter for the detected phase transitions showed different degrees of ordering in the compounds under study.

Keywords: transition metal oxides, magnetic phase transitions, spin glass state, bixbyite.

Received: 07.04.2023
Revised: 07.04.2023
Accepted: 16.04.2023

DOI: 10.21883/FTT.2023.06.55665.57



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