Abnormal magnetic behaviors induced by the antisite phase boundary in La_2NiMnO_6  

作　　者：赵月雷 柴一晟 潘礼庆 孙阳 

机构地区：[1]Department of Physics, University of Science and Technology Beijing [2]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences [3]College of Science and Research Institute for New Energy, China Three Gorges University

出　　处：《Chinese Physics B》2013年第8期221-224,共4页中国物理B（英文版）

基　　金：supported by the National Key Basic Research Program of China(Grant No.2011CB921801);the National Natural Science Foundation of China(Grant Nos.11074293 and 51021061)

摘　　要：The ferromagnetic semiconductor La2NiMnO6 （LNMO） has recently received much attention due to its high Curie temperature （Tc 280 K）, which is close to room temperature. We prepared single-phase LNMO polycrystaUine samples and investigated the temperature- and field-dependent magnetic behaviors of bulk LNMO. Between Tc and T＊ = 300 K, we observed upward and downward deviations from the Curie-Weiss law for high and low magnetic fields, respectively. From the electron spin resonance results, we can exclude the existence of the Griffiths phase. On the contrary, our results indicate that the abnormal magnetic behaviors might be induced by antisite phase boundaries with antiferromagnetic interaction.The ferromagnetic semiconductor La2NiMnO6 （LNMO） has recently received much attention due to its high Curie temperature （Tc 280 K）, which is close to room temperature. We prepared single-phase LNMO polycrystaUine samples and investigated the temperature- and field-dependent magnetic behaviors of bulk LNMO. Between Tc and T＊ = 300 K, we observed upward and downward deviations from the Curie-Weiss law for high and low magnetic fields, respectively. From the electron spin resonance results, we can exclude the existence of the Griffiths phase. On the contrary, our results indicate that the abnormal magnetic behaviors might be induced by antisite phase boundaries with antiferromagnetic interaction.

关 键 词：antisite phase boundary （APB） La2NiMnO6 electron spin resonance （ESR） 

分 类 号：O472.5[理学—半导体物理]