Observation of three magnetic states in spinel MnFe2O4 single crystals

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:497

Article

Nepal, Roshan¹  Saghayezhian, Mohammad¹  Zhang, Jiandi¹  Jin, Rongying¹ 

[1] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

关键词: Spinel oxides;    Non-collinear ferrimagnetism;    Magnetic phase transitions;   

DOI  :  10.1016/j.jmmm.2019.165955

来源: Elsevier

【 摘 要 】

Due to their unique structure that hosts geometric frustration, spinel oxides with magnetic ions in both the tetrahedral and octahedral environments undergo multiple spin rearrangement transitions. From the magnetization and thermal properties measurements of MnFe2O4, we have found three magnetic states occurring at T-FI-(1) = 575 K, T-FI-(2) = 50 K, and T-x = 15 K. Detailed analyses of the specific heat and thermal conductivity reveal a significant contribution from the low-temperature magnetic excitations. Especially, there is a large negative magneto-thermal conductivity with a maximum magnitude near T-FI-(2), which becomes positive below T-x. The possible origin of each magnetic state is discussed.

【 授权许可】

Free