Pr掺杂Bi_2Sr_2Ca_(1-x)Pr_xCu_2O_y体系维数渡越的研究  

INVESTIGATION OF THE DIMENSIONALCROSSOVER IN Pr-DOPEDBi_2Sr_2Ca_)1-x)Pr_xCu_2O_y SYSTEM

作　　者：孙雅琴[1,2] 冯双久[1] 李广[1] 周海东[1] 孙学峰[1] 李晓光[1] 

机构地区：[1]中国科学技术大学结构分析开放研究实验室,材料科学与工程系,合肥230026 [2]淮南工业学院

出　　处：《低温物理学报》2001年第3期179-183,共5页Low Temperature Physical Letters

基　　金：国家重点基础研究专项经费资助;国家自然科学基金资助项目

摘　　要：研究了Pr掺杂的Bi2 Sr2 Ca1-xPrxCu2 Oy 单晶的三维磁通线向二维饼涡旋的渡越 .发现渡越场B2D随温度的降低而缓慢增大 ,随Pr含量的增加而迅速减小 .认为Pr离子掺杂导致局部超导电性被抑制 ,CuO2 面有效超导面积显著减小 ,削弱了CuO2 层间的Josephson耦合 .The crossover from three-dimensional flux lattice to two-dimensional pancake vortices in Pr doped Bi-2Sr-2Cal-xPr-xCu-2O-y single crystals has been studied systematically. The crossover field B-{2D} increases gently with decreasing temperature, but decreases rapidly with the increases of Pr content. Local superconducting area shrinks strongly due to Pr doped, and adjacent CuO-2 layers coupling by Josephson interaction is weakened by the Pr ions as a result.

关 键 词：掺杂 Bi2212体系 超导体 维数渡越 

分 类 号：O511[理学—低温物理]