物理学报2013，Vol.62Issue(1)：418-424,7.DOI:10.7498/aps.62.017601
直接利用磁场和温度精确确定磁性材料La0.67Ca0.33MnO3和Pr0.7Sr0.3MnO3的电阻率
Prediction of the magneto-resistivity of manganese oxides La0.67Ca0.33MnO3 and Pr0.7Sr0.3MnO3 via temperature and magnetic field
摘要
Abstract
The resistivity related to temperature and magnetic field is a crucial parameter for determining the physical properties of the perovskite-type manganese oxide. The first task of this work is to find out a suitable method to predict the resistivities of La0.67Ca0.33MnO3 and Pr0.7Sr0.3MnO3 in the process from insulator phase to the metal phase via the temperature and the magnetic field. Based on the nonlinear numerical fitting, an analytical expression showing the dependence of the resistivity on temperature both less than and higher than the metal-insulator transition Curie temperature (Tc) at different magnetic fields, and the maximum resistivity (Pmax) corresponding to each Curie temperature is acquired. The second task of this work is to trace a mathematical relationship between the magnetic field and the maximum resistivity, and the Boltzmann function can be used successfully by numerical fitting. The lowest correlation coefficient and the largest average relative error between the actual and the calculated data are 0.998 and 4.35% in all considered cases respectively.关键词
钙钛矿结构锰氧化物/电阻率/转换温度/非线性数值拟合Key words
perovskite-type manganese oxides/ magneto-resistivity/ transition temperature/ nonlinear numerical fitting引用本文复制引用
刘雅洁..直接利用磁场和温度精确确定磁性材料La0.67Ca0.33MnO3和Pr0.7Sr0.3MnO3的电阻率[J].物理学报,2013,62(1):418-424,7.基金项目
浙江省教育厅科技项目(批准号:Y201122757)资助的课题. （批准号:Y201122757）
