Superconducting gap and valence band of Mg10Ir19B16 studied by laser and synchrotron photoemission spectroscopy

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  • Yoshida Rikiya
    The Graduate School of Natural Science and Technology, Okayama University
  • Okazaki Hiroyuki
    The Graduate School of Natural Science and Technology, Okayama University
  • Iwai Keisuke
    The Graduate School of Natural Science and Technology, Okayama University
  • Noami Kengo
    The Graduate School of Natural Science and Technology, Okayama University
  • Muro Takayuki
    Japan Synchrotron Radiation Research Institute (JASRI)/SPring-8
  • Okawa Mario
    Institute for Solid State Physics, The University of Tokyo
  • Ishizaka Kyoko
    Institute for Solid State Physics, The University of Tokyo
  • Shin Shik
    Institute for Solid State Physics, The University of Tokyo The Institute of Physical and Chemical Research (RIKEN)
  • Li Zheng
    Institute of Physics, Chinese Academy of Sciences
  • Luo Jianlin
    Institute of Physics, Chinese Academy of Sciences
  • Zheng Guo-qing
    The Graduate School of Natural Science and Technology, Okayama University
  • Oguchi Tamio
    Department of Quantum Matter, Graduate School of Advanced Sciences of Matter (ADSM), Hiroshima University
  • Hirai Masaaki
    The Graduate School of Natural Science and Technology, Okayama University Research Laboratory for Surface Science (RLSS), Okayama University
  • Muraoka Yuji
    The Graduate School of Natural Science and Technology, Okayama University Research Laboratory for Surface Science (RLSS), Okayama University JST, CREST
  • Yokoya Takayoshi
    The Graduate School of Natural Science and Technology, Okayama University Research Laboratory for Surface Science (RLSS), Okayama University JST, CREST

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  • Superconducting Gap and Valence Band of Mg<SUB>10</SUB>Ir<SUB>19</SUB>B<SUB>16</SUB> Studied by Laser and Synchrotron Photoemission Spectroscopy

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We report the results of first photoemission spectroscopy on a newly discovered noncentrosymmetric superconductor Mg10Ir19B16. We measured the valence band structure of Mg10Ir19B16 using soft X-ray photoemission technique and found that the first principal calculation explains our observation well. In the bulk-sensitive laser-excited photoemission study, we observed that the intensity at the Fermi level decreases as we lower the sample temperature, indicative of the opening of superconducting energy gap. Using Dynes’ function, we performed fitting analysis on the spectra of superconducting state.

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