中国物理B ›› 2013, Vol. 22 ›› Issue (10): 108103-108103.doi: 10.1088/1674-1056/22/10/108103

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Crystal growth, structural and physical properties of the 5d noncentrosymmetric LaOsSi3

张旭a b, 苗杉杉b, 王瀑b, 郑萍b, 尹文龙c, 姚吉勇c, 姜宏伟a, 王海a, 石友国b   

  1. a Department of Physics, Capital Normal University, Beijing 100048, China;
    b Beijing National Laboratory for Condensed Matter Physics & Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    c Center for Crystal Research and Development, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2013-07-10 修回日期:2013-08-02 出版日期:2013-08-30 发布日期:2013-08-30
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11274367, 10904097, and 11274233) and Chinese Academy of Sciences.

Crystal growth, structural and physical properties of the 5d noncentrosymmetric LaOsSi3

Zhang Xu (张旭)a b, Miao Shan-Shan (苗杉杉)b, Wang Pu (王瀑)b, Zheng Ping (郑萍)b, Yin Wen-Long (尹文龙)c, Yao Ji-Yong (姚吉勇)c, Jiang Hong-Wei (姜宏伟)a, Wang Hai (王海)a, Shi You-Guo (石友国)b   

  1. a Department of Physics, Capital Normal University, Beijing 100048, China;
    b Beijing National Laboratory for Condensed Matter Physics & Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    c Center for Crystal Research and Development, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2013-07-10 Revised:2013-08-02 Online:2013-08-30 Published:2013-08-30
  • Contact: Wang Hai, Shi You-Guo E-mail:wanghai@mail.cnu.edu.cn;ygshi@aphy.iphy.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11274367, 10904097, and 11274233) and Chinese Academy of Sciences.

摘要: LaOsSi3 single crystals are synthesized for the first time by an arc melting method. The crystal features a tetragonal BaNiSn3-type structure (space group I4mm) which lacks inversion symmetry along the crystallographic c axis and is isostructural with the intensively studied Rashba-type noncentrosymmetric superconductors LaRhSi3 and LaIrSi3. Unlike LaRhSi3 and LaIrSi3 displaying superconductivity, LaOsSi3 shows only metallic behavior over the measured temperature range of 2 K-300 K. The Sommerfeld coefficient γ derived from specific heat is 5.76 mJ·mol-1·K-2, indicating that LaOsSi3 has a weak electronic correlation effect. The absence of superconductivity in LaOsSi3 may lie in the Os 5d bands in the electronic structure. If it is true, it would be useful to provide complementary knowledge in understanding the relation between conduction and the d bands of M in LaMSi3 compounds (M=transition metals).

关键词: noncentrosymmetric compound, LaOsSi3, structural and physical properties

Abstract: LaOsSi3 single crystals are synthesized for the first time by an arc melting method. The crystal features a tetragonal BaNiSn3-type structure (space group I4mm) which lacks inversion symmetry along the crystallographic c axis and is isostructural with the intensively studied Rashba-type noncentrosymmetric superconductors LaRhSi3 and LaIrSi3. Unlike LaRhSi3 and LaIrSi3 displaying superconductivity, LaOsSi3 shows only metallic behavior over the measured temperature range of 2 K-300 K. The Sommerfeld coefficient γ derived from specific heat is 5.76 mJ·mol-1·K-2, indicating that LaOsSi3 has a weak electronic correlation effect. The absence of superconductivity in LaOsSi3 may lie in the Os 5d bands in the electronic structure. If it is true, it would be useful to provide complementary knowledge in understanding the relation between conduction and the d bands of M in LaMSi3 compounds (M=transition metals).

Key words: noncentrosymmetric compound, LaOsSi3, structural and physical properties

中图分类号:  (New materials: theory, design, and fabrication)

  • 81.05.Zx
81.10.Fq (Growth from melts; zone melting and refining) 82.75.Fq (Synthesis, structure determination, structure modeling)