Superconductivity in Noncentrosymmetric Iridium Silicide Li<sub>2</sub>IrSi<sub>3</sub>

DOI DOI Web Site 10 Citations 32 References Open Access
  • Sunseng Pyon
    Department of Physics, Okayama University, Okayama 700-8530, Japan
  • Kazutaka Kudo
    Department of Physics, Okayama University, Okayama 700-8530, Japan
  • Jun-ichi Matsumura
    Department of Physics, Okayama University, Okayama 700-8530, Japan
  • Hiroyuki Ishii
    Department of Physics, Okayama University, Okayama 700-8530, Japan
  • Genta Matsuo
    Department of Physics, Okayama University, Okayama 700-8530, Japan
  • Minoru Nohara
    Department of Physics, Okayama University, Okayama 700-8530, Japan
  • Hajime Hojo
    Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
  • Kengo Oka
    Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
  • Masaki Azuma
    Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
  • V. Ovidiu Garlea
    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, U.S.A.
  • Katsuaki Kodama
    Materials Science Research Unit, Quantum Beam Science Center, Sector of Nuclear Science Research, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • Shin-ichi Shamoto
    Materials Science Research Unit, Quantum Beam Science Center, Sector of Nuclear Science Research, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan

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Description

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.

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