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Transport Properties of La0.67Ca0.33MnO3
並列摘要
We have studied the specific heat C, the electrical resistivity p, and the magnetization M of La0.67Ca0.33MnO3 as functions of temperature T below 380 K. The specific heat obtained from low temperature data can be fitted to the expression C = γT + βT3 (2K ＜ T ＜ 20 K) by a least square analysis, where γ = 8.51 mJ/mole K^2 and β = 0.23 mJ/mole K^4, resulting in a Debye temperature ӨD = 204 K. In the specific heat curve, an anomalous endothermal peak is observed near 240 K. This endothermal effect is explained by the spin-charge coupling between local ion spins and itinerant electrons. However, the close relationship between the peaks near 150 K for both resistivity and magnetoresistance curves as functions of temperature suggests that it is associated with resistive transition.
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