高压增氧T′相铜氧化合物Eu_2CuO_(4+δ)低温反常磁性的研究  

MAGNETIC ABNORMALITY AT LOW TEMPERATURE IN T′ TYPE CUPRATE Eu 2CuO 4+ δ SYNTHESIZED UNDER HIGH PRESSURE

作　　者：熊玉峰[1] 金铎[1] 姚玉书[2] 吴非[2] 郭树权[2] 贾顺莲[2] 赵忠贤[2] 

机构地区：[1]中国科学院低温技术实验中心 [2]中国科学院物理所超导国家重点实验室

出　　处：《低温物理学报》1997年第5期366-371,共6页Low Temperature Physical Letters

摘　　要：本文系统地研究了高氧压下合成的Ｔ′相铜氧化合物Ｅｕ２ＣｕＯ４＋δ样品的结构及磁性，发现了一个由氧掺杂引起位于２８Ｋ具有弱铁磁性特征的磁化率反常．我们的结果表明氧掺杂导致的弱铁磁性不能按稀土离子的尺度效应来解释，而可能是氧掺杂在ＣｕＯ２面形成的空穴非均匀聚集导致的局域畸变产生．本文还对Ｔ′相超导体的一些超导特性作了解释．\ We report the results of X ray diffraction and dc magnetic susceptibility for oxygen doped Eu 2CuO 4+ δ sample which synthesized under high pressure. A new magnetic abnormality associated with weak ferromagnetism (WF) at 28 K was found. The results show that the appearance of WF in the oxygen doped T′ phase can not be completely attributed to the rare earth size effects, but to the distortion in CuO 2 planes caused by the doped oxygen. The superconductivity characteristic of T′ phase is also discussed.

关 键 词：T'相 稀土铜氧化物 低温磁性 超导电性 

分 类 号：O511.2[理学—低温物理]