双钙钛矿氧化物La2-xCaxCoMnO6磁性能研究  

Magnetic Study of Double Perovskite Oxide La2-xCaxCoMnO6

作　　者：刘瑞红 李晓欣 徐宝[1,2] 陈金欢 陈梦蝶 吴鸿业[1,2] LIU Ruihong;LI Xiaoxin;XU Bao;CHEN Jinhuan;CHEN Mengdie;WU Hongye(School of Physics Science and Technology,Baotou Teachers' College,Baotou 014030,China;Key Laboratory for Magnetism and Magnetic Material of Inner Mongolia Autonomous Region,Baotou Teachers' College,Baotou 014030,China)

机构地区：[1]包头师范学院物理科学与技术学院,内蒙古包头014030 [2]内蒙古自治区磁学与磁性材料重点实验室,包头师范学院,内蒙古包头014030

出　　处：《有色金属工程》2021年第2期25-30,62,共7页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(61565013);阴山学者培养计划;2017校级青年科技英才。

摘　　要：采用传统高温固相法制备了La2-xCaxCoMnO6(x=0.6,0.75)多晶,该组样品属于单斜晶系,P21/n空间群。当La2-xCaxCoMnO6样品中x=0.75时,观察M-T下的FC曲线,可以看出该样品中磁化强度出现了负值,即负磁化现象。通过磁化率与温度的乘积(χ^T)与温度(T)的变化曲线确定了两组样品的奈尔温度TN,进一步分析得出,两组样品在低温区域出现了团簇玻璃行为;分析磁化率倒数(χ^-1)和温度(T)的变化曲线与居里-外斯(C-W)拟合直线,得出两样品均出现类Griffiths相。A series of polycrystalline samples of perovskite manganese oxide La2-xCaxCoMnO6(x=0.6,0.75)were prepared by traditional high temperature solid state reaction method.The samples are monoclinic crystal system,and the spatial point group of which is P21/n.When x=0.75,it can be seen from the FC curve under M-T that there is a negative magnetization in the sample,that is called negative magnetization.Neil temperature(TN)of the two sets of samples was ascertained according to the curve of product of the magnetic susceptibility and temperature(χ^T)and the change of temperature(T),further analysis showed that the two sets of samples appear cluster glass behavior at low temperature.By analyzing the curve of reciprocal susceptibility(χ^-1)temperature(T)and Curie Weiss fitting line(C-W),it can be known that both samples have Griffiths-like phase.

关 键 词：双钙钛矿 自旋玻璃态 负磁化 类Griffiths相 

分 类 号：O049[理学]