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Fe1.01Se0.4Te0.6单晶的超导电性研究
  • ISSN号：1000-3258
  • 期刊名称：《低温物理学报》
  • 时间：0
  • 分类：O511.2[理学—低温物理;理学—物理]
  • 作者机构：[1]上海大学理学院物理系,上海200444
  • 相关基金：国家自然科学基金（批准号：50932003 11074163）; 上海市教育委员会科技创新基金重点项目（批准号：09ZZ95）; 上海市科学技术委员会发展基金（No.08dj1400202 10ZR1411000）资助的课题
作者： 沈少喜[1], 曹世勋[1], 陈腊[1], 袁淑娟[1], 康保娟[1], 张金仓[1]
关键词： FeSe超导体, 单晶, 结构相变, 应变测量, FeSe superconductor, single crystal, structural transition, strain measurement
中文摘要：

本文采用自助溶剂法生长得到Fe1.01Se0.4Te0.6单晶样品,超导零电阻温度Tczero=11.0 K,部分样品经400℃进行48小时退火之后,超导零电阻温度变为Tczero=7.0K.分析表明退火后样品的Fe含量变大,超导电性被部分抑制.通过磁场下电阻率-温度曲线的实验测量,用WHH（Werthamer-Helfand-Hohenberg）方法估算得到退火前后样品在0K附近的上临界场分别为83.2T和61.3T.上临界场μ0Hc2（T）随温度变化曲线在0T附近向高温方向上翘,说明样品具有＂二流体＂行为.直流磁化曲线在40K和120K分别出现向下弯曲,40K处的变化可能对应于过量Fe的自旋冻结.应变测量结果显示样品在117K时应变值发生一个突变,变化量约为晶格参数的0.06%,显示样品发生一个结构相变.因此,120K处的磁化下降对应于样品从四方相到正交相的结构转变.

英文摘要：

Fe1.01Se0.4Te0.6 single crystal with zero resistant temperature Tzeroc=11.0K was grown by using self-flux method.After annealing at 400℃ for 48 h for part of the sample,superconductivity was suppressed with Tzeroc~7.0K,which may resulted from excess Fe in the annealed sample.The upper critical field at zero temperature was estimated to be 83.2 T before annealing and 61.3 T after annealing using WHH（Werthamer-Helfand-Hohenberg） theory.All μ0Hc2（T）values for both samples show upturns near 0T indicating a ＇two component＇ response.DC magnetism shows two decreases at 40K and 120K.The decrease at 40K may be related to the spin freezing of the excess Fe.Strain measurement for the sample shows a mutation at 117K,about 0.06% of the lattice parameter,indicating a structural transition.The decrease at 120K is corresponding to a structural transition from tetragonal to triclinic.

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期刊信息
  • 《低温物理学报》
  • 北大核心期刊（2011版）
  • 主管单位:中国科学院
  • 主办单位:中国科学技术大学
  • 主编：赵忠贤
  • 地址：安徽省合肥市金寨路96号
  • 邮编：230026
  • 邮箱：LiBiyou@ustc.edu.cn
  • 电话：0551-3601359
  • 国际标准刊号：ISSN：1000-3258
  • 国内统一刊号：ISSN：34-1053/O4
  • 邮发代号:26-136
  • 获奖情况:
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  • 被引量:1577