金香;孙晓东;曹凤泽;田野;云慧琴;鲁毅;赵建军;

• 1:包头师范学院内蒙古自治区高等学校磁学与磁性材料重点实验室

摘要(Abstract)：

多晶样品La_(0.875)Eu_(0.025)Sr_(0.1)MnO_3用传统固相反应法制备得到。X射线衍射仪(XRD)表明样品为纯相。通过测量磁化强度随温度的变化曲线(M-T)、不同温度下磁化强度随磁场的变化曲线(M-H)研究了该多晶样品的磁性及磁卡效应。研究发现:样品在低温部分表现出团簇自旋玻璃的特征,在15～125 K温度范围内表现为铁磁特征;在125～350 K温度范围内表现出预成型团簇相的特征;在350 K以上表现出纯顺磁特征。在居里温度T_C≈119 K附近,系统发生了二级相变而且出现较大的磁熵变值,样品在7 T外加磁场下的最大磁熵变绝对值为2.83J·K~(-1)·kg~(-1),磁制冷效率为427.53 J·kg~(-1)。因此,该样品具有在高温区实现磁制冷的潜能。

关键词(KeyWords)： 钙钛矿;磁性;磁熵变;相变;稀土

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(11164019,51562032,61565013);; 内蒙古自然科学基金项目(2015MS0109);; 内蒙古高校科研重点项目基金项目(NJZZ11166,NJZY16237,NJZY12202);; 包头市科技局项目(2015Z2011);; 包头师范学院青年科学研究基金项目(BSYKJ2014-22)资助

作者(Author): 金香;孙晓东;曹凤泽;田野;云慧琴;鲁毅;赵建军;

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