Superconductivity in Noncentrosymmetric Iridium Silicide Li2IrSi3
Superconductivity in Noncentrosymmetric Iridium Silicide Li2IrSi3
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DOI：
10.7566/jpsj.83.093706
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发表时间：
2014-07
期刊：
影响因子：
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通讯作者：
S. Pyon;K. Kudo;Jun-ichi Matsumura;Hiroyuki Ishii;Genta Matsuo;Minoru Nohara;H. Hojo;K. Oka;Masaki Azuma;V. Garlea;K. Kodama;S. Shamoto
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文献类型：
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作者：
S. Pyon;K. Kudo;Jun-ichi Matsumura;Hiroyuki Ishii;Genta Matsuo;Minoru Nohara;H. Hojo;K. Oka;Masaki Azuma;V. Garlea;K. Kodama;S. Shamoto
研究了锂的吸附对非中心对称结构的二元硅化物IrSi3晶体结构和电子性质的影响。X射线和中子衍射实验表明，六方IrSi3(P6_3mc空间群)在锂吸附后转变为三方Li2IrSi3(P31c空间群)。Li2IrSi3的结构是由硅原子组成的平面Kagome网络，Li和Ir在Kagome层之间的间距不相等，导致沿c轴的极性结构。Li2IrSi3具有II型超导电性，其转变温度T_c为3.8K，呈现出以往超导体所没有的结构类型。
The effects of lithium absorption on the crystal structure and electronic properties of IrSi3, a binary silicide with a noncentrosymmetric crystal structure, were studied. X-ray and neutron diffraction experiments revealed that hexagonal IrSi3 (space group P6_3mc) transforms into trigonal Li2IrSi3 (space group P31c) upon lithium absorption. The structure of Li2IrSi3 is found to consist of a planar kagome network of silicon atoms with Li and Ir spaced at unequal distances between the kagome layers, resulting in a polar structure along the c-axis. Li2IrSi3 exhibited type-II superconductivity with a transition temperature Tc of 3.8 K, displaying a structure type that no previous superconductors have been reported to have.