Superconductivity and normal state magnetoresistance in superconducting FeSe:Sb

查看全文 作　　者：CHU [1]HaiFeng;LI [1]Jie;LI [1]Shao;ZHANG [1]Yu;WANG [1]Ning;WANG [1]Jia;GAO [1,2]YanLi;DENG [1]Hui;SUN [2]XiaoSong;ZHENG [1]DongNing

机构地区：[1]National Laboratory for Superconductivity,Institute of Physics and National Laboratory for Condensed Matter Physics,Chinese Academy of Sciences,Beijing 100190,China;[2]College of Materials Science and Engineering,Sichuan University,Chengdu 610064,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2010年第53卷第7期,共7页

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 10974243,10911130357 and 50672125) and Ministry of Science and Technology of China 摘　　要：We prepared a series of β-FeSe samples with a nominal composition of Fe1.11Se1-xSbx(0≤x≤0.5).The X-ray diffraction,transport and magnetic measurements were performed on these samples to investigate the structure,the superconducting properties and the normal state transport and magnetic properties.Although the X-ray diffraction data suggested that Sb atoms were not incorporated into the β-FeSe phase,the transport data showed observable changes of superconductivity,normal state resistivity and magnetoresistance.This was represented by the increase in the superconducting transition temperature and the upper critical field.Also,for the samples with a low level of Sb content,a clear decrease of the normal state resistivity and a substantial increase of the residual resistance ratio were observed.Furthermore,the samples showed a significant increase of the normal state magnetoresistance that appeared not to follow the Kohler's rule.The results were discussed in the frame of reduction of excess Fe at interstitial sites of β-FeSe. 关键词：IRON-BASED SUPERCONDUCTOR SUPERCONDUCTIVITY MAGNETORESISTANCE

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Superconductivity and normal state magnetoresistance in superconducting FeSe:Sb

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