Physics of the Solid State
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Influence of Ga-substitution to the structural and magnetic properties of (Mn,Fe)2O3 bixbyite
Moshkina E. M.
1, Molokeev M. S.1,2,3, Eremin E. V.1,2,4, Bezmaternykh L. N.1
1Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
2Siberian Federal University, Krasnoyarsk, Russia
3Far Eastern State Transport University, Khabarovsk, Russia
4Siberian State University of Science and Technology, Krasnoyarsk, Russia
2Siberian Federal University, Krasnoyarsk, Russia
3Far Eastern State Transport University, Khabarovsk, Russia
4Siberian State University of Science and Technology, Krasnoyarsk, Russia
Email: ekoles@iph.krasn.ru, bezm@iph.krasn.ru
To study the dependence of the properties of ternary oxides (Mn,Fe,Ga)2O3 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 Fe1.1Mn0.76Ga0.14O3 and Fe0.65Mn1.1Ga0.26O3 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.
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