【摘 要】
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The measurement of low-field susceptibility X as a function of temperature T for La2/3Ca1/3MnO3 shows a significant downtu in 1/x(T) above the Curie temperature
【机 构】
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Department of Physics, Huazhong University of Science and Technology, Wuhan 430074
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The measurement of low-field susceptibility X as a function of temperature T for La2/3Ca1/3MnO3 shows a significant downtu in 1/x(T) above the Curie temperature TC, a behaviour generally observed in perovskite manganites. Such a downtu 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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