Origin of the Downturn in Inverse Susceptibility Observed above the Curie Temperature in Perovskite Manganites
YUAN Song-Liu, CHEN Wei, ZHAO Li-Feng, DOYANANDA Debnath, MIAO Ju-Hong, WANG Yong-Qiang, YUAN Li, SHANG
Jing-Lin, XIAO Li-Xia, CAO Heng, XIA Zheng-Cai
Department of Physics, Huazhong University of Science and Technology, Wuhan 430074
Origin of the Downturn in Inverse Susceptibility Observed above the Curie Temperature in Perovskite Manganites
YUAN Song-Liu;CHEN Wei; ZHAO Li-Feng;DOYANANDA Debnath;MIAO Ju-Hong;WANG Yong-Qiang;YUAN Li;SHANG
Jing-Lin;XIAO Li-Xia;CAO Heng;XIA Zheng-Cai
Department of Physics, Huazhong University of Science and Technology, Wuhan 430074
关键词 ：
75.47.Gk ,
76.30.-v ,
75.30.Kz
Abstract ： The measurement of low-field susceptibility X as a function of temperature T for La2/3 Ca1/3 MnO3 shows a significant downturn in 1/X (T) above the Curie temperature TC , a behaviour generally observed in perovskite manganites. Such a downturn is argued to be due to the segregation of ferromagnetic clusters with larger spins in the paramagnetic matrix. Based on this consideration, a phenomenological expression for X(T) is proposed, in which the total susceptibility is assumed to be a sum of two susceptibilities arising from magnetic entities in the PM background and the FM clusters with T-dependent effective spins, respectively. The result is in good agreement with the experimental data obtained in La2/3 Ca1/3 MnO3 .
Key words ：
75.47.Gk
76.30.-v
75.30.Kz
出版日期: 2005-06-01
:
75.47.Gk
(Colossal magnetoresistance)
76.30.-v
(Electron paramagnetic resonance and relaxation)
75.30.Kz
(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
引用本文:
YUAN Song-Liu;CHEN Wei; ZHAO Li-Feng;DOYANANDA Debnath;MIAO Ju-Hong;WANG Yong-Qiang;YUAN Li;SHANG
Jing-Lin;XIAO Li-Xia;CAO Heng;XIA Zheng-Cai. Origin of the Downturn in Inverse Susceptibility Observed above the Curie Temperature in Perovskite Manganites[J]. 中国物理快报, 2005, 22(6): 1511-1514.
链接本文:
https://cpl.iphy.ac.cn/CN/
或
https://cpl.iphy.ac.cn/CN/Y2005/V22/I6/1511
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