EuSr_2Ru_(1-x)TaxCu_2O_8体系的超导电性和磁性质  

SUPERCONDUCTIVITY AND MAGNETISM FOR EuSr_2Ru_(1-x)Ta_xCu_2O_8 SYSTEM

作　　者：林杨帆[1] 鲁俊生[2] 张国芳[3] 贺青[1] 王杭栋[1] 方明虎[1] 

机构地区：[1]浙江大学物理系,杭州310027 [2]浙江万里学院,宁波315100 [3]河南南阳师范学院物理系,南阳473061

出　　处：《低温物理学报》2003年第A01期115-119,共5页Low Temperature Physical Letters

基　　金：国家 973计划 (项目编号 :NKBRSF G19990 6460 2 );教育部优秀青年教师计划资助~~

摘　　要：通过对EuSr2 Ru1 -xTaxCu2 O8(x=0 ,0 .1 ,0 .2 ,0 .5和 1 .0 )体系的结构、电阻和磁化强度的观测 ,结果发现 :EuSr2 RuCu2 O8(x=0 )样品在 1 30 .2K以下呈现铁磁有序 ,在 1 0K时发生了超导转变 ,并呈现典型的欠掺杂高温超导体特征 ,随着Ta对Ru替代浓度x值的增加 ,铁磁相变温度和超导临界温度均下降 .同时 ,对该体系中的元素替代效应 ,及其磁有序和超导电性的共存进行了详细讨论 .The measurements of the structure, resistance and magnetization were carried out for EuSr-2Ru-{1-x}Ta-xCu-2O-8 (x0, 0.1, 0.2, 0.5 and 1.0) samples. It is found that the EuSr-2RuCu-2O-8 compound exhibits a ferromagnetic order of Ru moments below T-c130.2K, and becomes superconducting at a much lower temperature T-c10K, and shows the typical characteristics of underdoped high T-c superconductors. The ferromagnetic transition temperature and superconducting transition temperature decrease with increasing the substitution concentration x value of Ta for Ru. The effect of element substitution, the coexistence of magnetism and superconductivity in this system are discussed in detail.

关 键 词：高温超导 超导电性 磁化强度 超导转变温度 欠掺杂 铁磁相变温度 超导临界温度 临界电流 磁化率 

分 类 号：O511[理学—低温物理]