| Original Articles |
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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 |
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| Cite this article: |
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YUAN Song-Liu, CHEN Wei, ZHAO Li-Feng et al 2005 Chin. Phys. Lett. 22 1511-1514 |
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Abstract 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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| Keywords:
75.47.Gk
76.30.-v
75.30.Kz
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Published: 01 June 2005
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| PACS: |
75.47.Gk
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(Colossal magnetoresistance)
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76.30.-v
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(Electron paramagnetic resonance and relaxation)
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75.30.Kz
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(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
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