【摘要】 研究了Y0.75Ca0.25MnO3体系的结构和电磁特性,结果表明,场冷(FC)和零场冷(ZFC)直流磁化曲线在低温下存在典型的分叉现象,相应的Tcusp=34K;不同频率下交流磁化测量表明了随着频率的增加自旋冻结温度Tf=Tcusp向高温区移动,结合电输运测量,证明Y0.75Ca0.25MnO3体系为一典型的自旋玻璃绝缘(SGI)体系。更多还原

【Abstract】 The structure and electromagnetic properties of perovskite manganite Y_0.75Ca_0.25MnO₃ were systematically investigated.In low temperatures,a typical behavior of bifurcation was observed between field-cooled（FC） and zero-field-cooled（ZFC） magnetization with a cusp at T_cusp=34K in the ZFC magnetization curve.AC susceptibility also showed a cusp at T_f=T_cusp,called spin-glass freezing temperature,which shifts to high temperature with increasing frequencies.With the resistivity behavior in the electrical transport measurement,we considered an intrinsic spinglass insulator（SGI） in the Y_0.75Ca_0.25MnO₃ system.更多还原