Y0．928Pr0．072Ba2Cu3O7超导单晶的钉扎机制研究  

STUDY OF PINNING MECHANISMS IN Y_(0.928)Pr_(0.072)Ba_2Cu_3O_7 SINGLE CRYSTALS SUPERCONDUCTOR

作　　者：金刚[1,2] 秦正平[3] 蔡传兵[3] 曹世勋[3] 姚忻[2] 张金仓[3] 

机构地区：[1]周口师范学院物理系,河南周口466000 [2]上海交通大学物理系,上海200030 [3]上海大学物理系,上海200444

出　　处：《低温物理学报》2009年第2期162-165,共4页Low Temperature Physical Letters

基　　金：国家自然科学基金(项目编号:10774097);教育部长江学者和创新团队发展计划(项目编号:IRT0739);上海市科委基础研究重点项目(项目编号:07JC14022)资助课题~~

摘　　要：研究了Y0.928Pr0.072Ba2Cu3O7(后文称YPBCO)单晶在不同温度下的磁特性,计算了不同温度下的钉扎力密度Fp对磁场的依赖关系.结果表明,在不同温度下的钉扎力密度可近似标度在同一条曲线上;标度函数和峰效应引起的最大Jc所对应的磁场与不可逆场的比值都表明,YPBCO单晶在磁通玻璃态的钉扎机制主要是样品中Pr的微观电子分布不均匀性引起的正常相面钉扎.The magnetization curves at different temperatures have been measured in Y0.928 Pr0.072 Ba2Cu3O7 （YPBCO） single crystals. The magaetic field dependence of pinning force density Fp is obtained, and it is shown that the pinning force density in different temperatures can be scaled on the same curve. The scaling function as well as the ratio of the maximum pinning force field vs irreversibility field indicate that the pinning mechanisms in YPBCO single crystals is mainly the normal surface pinning causedl by the ion of Pr isdistributed in the sigle crystals.

关 键 词：YPBCO单晶 钉扎力标度 正常相面钉扎 微观相分离 

分 类 号：O614.322[理学—无机化学]