Origin of the Downturn in Inverse Susceptibility Observed above the Curie Temperature in Perovskite Manganites |
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作者姓名: | 袁松柳 陈伟 赵力峰 DOYANANDADebnath 缪菊红 王永强 袁力 商景林 肖利霞 曹恒 夏正才 |
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作者单位: | DepartmentofPhysics,HuazhongUniversityofScienceandTechnology,Wuhan430074 |
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摘 要: | The measurement of low-field susceptibility X as a function of temperature T for La2/3Ca1/3MnO3 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 La2/3Ca1/3MnO3.
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关 键 词: | 抗磁化系数 居里温度 钙钛矿 亚锰酸盐 |
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