Sr_2RuO_4超导转变温度附近c方向磁阻行为研究  

MAGNETORESISTANCE ANALYSIS OF Sr_2RuO_4 NEAR SUPERCONDUCTING TRANSITION TEMPERATURE

作　　者：刘亚静[1] 雒建林[2] 陈兆甲[2] 王万录[1] 

机构地区：[1]重庆大学应用物理系,重庆400044 [2]中国科学院物理研究所,北京100080

出　　处：《低温物理学报》2004年第2期101-106,共6页Low Temperature Physical Letters

基　　金：国家自然科学基金 (批准号 :10 0 74 0 80 ;10 2 74 10 1)资助的课题~~

摘　　要：测量了Sr2 RuO4 正常态和超导转变温度附近 (T =1.5K ,4 .0K ,6K)c方向的磁阻 ,通过对正常态磁阻分析获得了Sr2 RuO4 在温度 4K和 6K下的平均自由程 .通过超导涨落分析获得了Sr2 RuO4 的超导特性参数 ξab(0 )和 ξc(0 )We report a detailed study of the c-axis magnetoresistance near superconducting transition temperature in Sr-2RuO-4, the layered perovskite superconductor which does not contain copper. By the analysis of the normal state magnetoresistance we have obtained the in-plane mean free path. A large positive magnetoresistance near T-c has been observed, which is originated from superconducting fluctuations. The fluctuation-enhanced magnetoconductivity very close to T-c shows well agreement with Aslamasov-Larkin(AL) prediction for a 2-D superconductor, and the coherence lengths of Sr-2RuO-4 have been deduced from fluctuation magnetoresistance analysis at 1.5K.

关 键 词：超导转变温度 磁阻 超导涨落 正常态 钌酸锶 平均自由程 

分 类 号：O511[理学—低温物理]