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锰氧化物La_0.55Ca_0.45MnO₃输运性质的研究

Study On Transport Properties inManganite Oxide La_0.55Ca_0.45MnO₃

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【Author】 Chen Qin~(a,b) Pan Yalin~c Fuyang Branch,Radio and Television University of Anhui,Fuyang,Anhui 236010 ~bDepartment of Materials Science and Engineering,University of Sciences and Technology of China,Hefei,Anhui 230026 ~cDepartment of Environmental Engineering and Electron,Anhui Institute of Architecture,Hefei,Anhui 230032

【机构】安徽广播电视大学阜阳分校；安徽建筑工业学院环境工程与电子系阜阳 236010 中国科学技术大学材料科学与工程系；合肥 230026；合肥 230022；

【摘要】本文中,利用交流磁化率、电阻率、热电势和ERP谱等多种测量手段对锰氧化物La_0.55Ca_0.45MnO₃多晶样品的输运性质和磁阻特性进行研究。实验结果表明,是双交换作用和小极化子效应的共同作用决定了CMR效应的特性。La_0.55Ca_0.45MnO₃与La_0.7Ca_0.3MnO₃样品的电阻率在T<<T_c时的差异可用晶界效应来解释。更多还原

【Abstract】 The properties of transport and magnetoresistance of manganite oxide La_0.55Ca_0.45MnO₃ polycrystalline were studied by measuring the susceptibility、resistivity、thermoelectric power and electron paramagnetic resonance spectra. The experimental evidences show that both actions of double exchange interaction and small polarons are responsible for the variation of the CMR effect. The differences between La_0.7Ca_0.3MnO₃ and La_0.55Ca_0.45MnO₃in the curves of resistivity at T<<Tc can be explained with the grain boundary effect.更多还原