中国物理B ›› 2007, Vol. 16 ›› Issue (8): 2471-2474.doi: 10.1088/1009-1963/16/8/052

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Effect of Te doping on superconductivity and charge-density wave in dichalcogenides 2H-NbSe2-xTex (x=0, 0.1, 0.2)

王洪涛1, 叶德枢1, 程新红1, 李林军2, 许祝安2   

  1. (1)Department of Physics and Information Science, Wenzhou University, Wenzhou 325027, China; (2)Department of Physics, Zhejiang University, Hangzhou 310027, China
  • 收稿日期:2007-04-09 修回日期:2007-04-23 出版日期:2007-08-20 发布日期:2007-08-20
  • 基金资助:
    Project supported by the Natural Science Foundation of Zhejiang Province, China (Grant No~Y605106) and National Basic Research Program of China (Grant No~2006CB601003).

Effect of Te doping on superconductivity and charge-density wave in dichalcogenides 2H-NbSe2-xTex (x=0, 0.1, 0.2)

Wang Hong-Tao(王洪涛)a), Li Lin-Jun(李林军)b), Ye De-Shu(叶德枢)a), Cheng Xin-Hong(程新红)a), and Xu Zhu-An(许祝安)b)†   

  1. a Department of Physics and Information Science, Wenzhou University, Wenzhou 325027, China; b Department of Physics, Zhejiang University, Hangzhou 310027, China
  • Received:2007-04-09 Revised:2007-04-23 Online:2007-08-20 Published:2007-08-20
  • Supported by:
    Project supported by the Natural Science Foundation of Zhejiang Province, China (Grant No~Y605106) and National Basic Research Program of China (Grant No~2006CB601003).

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摘要： Single crystals of Te-doped dichalcogenides 2H-NbSe2-xTex(x = 0, 0.10, 0.20) were grown by vapour transport method. The effect of Te doping on the superconducting and charge-density wave (CDW) transitions has been investigated. The sharp decrease of residual resistance ratio, RRR = R(300K)/R(8K), with increasing Te content was observed, indicating that the disorder in the conducting plane is induced by Te doping. Meanwhile the superconducting transition temperature, Tc, decreases monotonically with Te content. However, the CDW transition temperature, TCDW, shown by a small jump in the temperature dependence of the resistivity near 30~K, increases slightly. The results show that the suppression of superconductivity might be caused by the enhancement of CDW ordering. The disorder has little influence on the CDW ordering.

关键词: low-dimensional metal, superconductivity, charge-density wave, disorder

Abstract: Single crystals of Te-doped dichalcogenides 2H-NbSe2-xTex(x = 0, 0.10, 0.20) were grown by vapour transport method. The effect of Te doping on the superconducting and charge-density wave (CDW) transitions has been investigated. The sharp decrease of residual resistance ratio, RRR = R(300K)/R(8K), with increasing Te content was observed, indicating that the disorder in the conducting plane is induced by Te doping. Meanwhile the superconducting transition temperature, Tc, decreases monotonically with Te content. However, the CDW transition temperature, TCDW, shown by a small jump in the temperature dependence of the resistivity near 30 K, increases slightly. The results show that the suppression of superconductivity might be caused by the enhancement of CDW ordering. The disorder has little influence on the CDW ordering.

Key words: low-dimensional metal, superconductivity, charge-density wave, disorder

中图分类号:  (Effects of crystal defects, doping and substitution)

  • 74.62.Dh
71.45.Lr (Charge-density-wave systems)