SrAuSi3: A Noncentrosymmetric Superconductor

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• 作者：Masaaki Isobe ; Hiroyuki Yoshida ; Koji Kimoto ; Masao Arai ; Eiji Takayama-Muromachi
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：March 25, 2014
• 年：2014
• 卷：26
• 期：6
• 页码：2155-2165
• 全文大小：683K
• 年卷期：v.26,no.6(March 25, 2014)
• ISSN：1520-5002

文摘

A novel strontium鈥揼old silicide (SrAuSi₃) was successfully synthesized for the first time using a high-pressure technique, at 6 GPa. X-ray Rietveld analysis and scanning transmission electron microscopy studies clearly revealed that SrAuSi₃ crystallizes in a BaNiSn₃-type structure, in space group I4mm with the following lattice parameters: a = 4.4090(1) 脜, and c = 9.9475(3) 脜. The structure was found not to have inversion symmetry in real space. From direct measurements of polycrystalline SrAuSi₃, the electrical resistivity was zero, the static magnetic susceptibility was almost a full volume Meissner diamagnetic signal, and the specific heat exhibited a sharp jump, all of which were accompanied by a phase transition due to bulk superconductivity at a critical temperature (T_C) of 1.54 K. The SrAuSi₃ compound is the first noncentrosymmetric superconductor that includes Au as a principal constituent element.