HoFe_(1-x)Mn_xO_3(x=0,0.1,0.2)的磁热效应研究  

MAGNETOCALORIC PROPERTIES IN HoFe_(1-x)Mn_xO_3( x=0, 0.1, 0.2 )

作　　者：谢慧[1] 袁淑娟[1] 曹义明[1] 杨亚[1] 康保娟[1] 鲁波[2] 曹世勋[1] 张金仓[1] 

机构地区：[1]上海大学物理系,上海大学,上海200444 [2]上海大学微结构重点实验室,上海大学,上海200444

出　　处：《低温物理学报》2013年第5期350-354,共5页Low Temperature Physical Letters

基　　金：国家自然科学基金项目(批准号:11274221,50932003);上海市教育委员会科技创新项目(批准号:12YZ018)的资助~~

摘　　要：采用固相反应法制备了HoFe1-xMnx03（x=0，0．1，0．2）多晶样品，对其磁性和磁热效应进行了研究．随着Mn含量的增加，自旋重取向转变温区向高温方向移动，当Mn含量x=0．2时，自旋重取向转变温区达到210-220K；随着Mn元素掺杂量的增加，磁化强度先变强后变弱，Ho离子反铁磁有序温度先升高后降低．当Mn含量z=0．1时，由Ho离子反铁磁有序相变导致的磁熵变值在磁场为7T时达到最大，为-12．5J／kgK，制冷功率RC为298J／kg．实验结果表明少量Mn的引入有利于磁性和磁热效应的增强．HoFe1-xMnx03（x=0,0.1,0.2） polycrystalline samples were prepared by conventional solid state re- action method and their magnetic and magnetocaloric properties have been studied. The spin reorientation tempera- ture increases with increasing Mn doping, and the spin reorientation temperature reaches 210-220K for x= 0. 2. With the doping content of Mn increases, the magnetization first increases and then decreases, and the antiferromag- netic order temperature of Ho ion increases and then decreases. The largest magnetic entropy change of --12. 5 J/ kgK and refrigeration capacity of 298 J/kg were acquired at 7 T as x=0. 1, which is caused by Ho ion antiferromag- netie order. The studies show that low amount of Mn doping is helpful for enhancing magnetic and magnetocaloric effect.

关 键 词：自旋重取向 反铁磁有序 磁熵变 磁热效应 

分 类 号：O482.5[理学—固体物理]