Y_(1-x)Gd_xCrO_3(x=0～0.3)的负磁化和磁化反转行为研究（英文）  

NEGATIVE MAGNETIZATION AND REVERSION BEHAVIOR IN Y_(1-x)Gd_xCrO_3(x=0～0.3)

作　　者：邓冬梅[1,2] 夏立祥 王星宇[1,2] 戴玉蓉[1,2] 鲁波[3] 康保娟[1,2] 敬超[1,2] 曹世勋[1,2] 张金仓[1,2] 

机构地区：[1]上海大学物理系 [2]上海大学材料基因组工程研究院,上海200444 [3]上海大学分析测试中心及微结构实验室,上海200444

出　　处：《低温物理学报》2015年第4期251-256,共6页Low Temperature Physical Letters

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11074163,61171033);the Key Basic Research Program of Science and Technology Commission of Shanghai Municipality(Grant No.13JC1402400)~~

摘　　要：用固相反应法制备了Y1-xGdxCrO3和YCrO3多晶样品,并对样品的磁特性进行了研究.100Oe的场冷和零场冷热磁曲线均出现了负磁化及磁化反转行为.这一行为来自于Gd3+和Cr3+的反铁磁相互作用且可以用Gd3+的顺磁效应来解释.随着冷却场的增大,场冷负磁化行为逐渐被抑制,当冷却场与拟合所得的内场大小一致时,负磁化行为消失.也就是说,当外场小于内场时,负磁化行为将会出现,反之则消失.Y_（1-x）Gd_xCrO_3 and YCrO_3 polycrystalline samples were prepared by solid state reaction and their magnetic properties have been studied. The thermomagnetic curve of Y_（1-x）Gd_xCrO_3 in field-cooled and zero-field cooled mode with applied field of 100 Oe exhibit negative magnetization behavior. This behavior stems from the antiferromagnetic interaction between Gd3＋ and Cr2＋ ions and can be fitted by the paramagnetic effect of Gd3＋ ions. The negative magnetization can be adjusted by the applied external field, get restrained, and eventually disappear when the external field is high enough, in agreement with the internal magnetic field in the fitting result, i.e. the negative magnetization behavior arises when the external field is weaker than the internal magnetic field, and disappears on the opposite.

关 键 词：Y1-xGdxCrO3 负磁化 反铁磁耦合 

分 类 号：O482.5[理学—固体物理]