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

doi:10.1088/1674-1056/22/10/108103

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).

Keywords: noncentrosymmetric compound LaOsSi₃ structural and physical properties

Received: 10 July 2013
Revised: 02 August 2013
Accepted manuscript online:

PACS:	81.05.Zx	(New materials: theory, design, and fabrication)
	81.10.Fq	(Growth from melts; zone melting and refining)
	82.75.Fq	(Synthesis, structure determination, structure modeling)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11274367, 10904097, and 11274233) and Chinese Academy of Sciences.

Corresponding Authors: Wang Hai, Shi You-Guo
E-mail: wanghai@mail.cnu.edu.cn;ygshi@aphy.iphy.ac.cn

Cite this article:

Zhang Xu (张旭), Miao Shan-Shan (苗杉杉), Wang Pu (王瀑), Zheng Ping (郑萍), Yin Wen-Long (尹文龙), Yao Ji-Yong (姚吉勇), Jiang Hong-Wei (姜宏伟), Wang Hai (王海), Shi You-Guo (石友国) Crystal growth, structural and physical properties of the 5d noncentrosymmetric LaOsSi₃ 2013 Chin. Phys. B 22 108103

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

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