Superconducting Gap and Valence Band of Mg_<10>Ir_<19>B_<16> Studied by Laser and Synchrotron Photoemission Spectroscopy(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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We report the results of first photoemission spectroscopy on a newly discovered noncentrosymmetric superconductor Mg_<10>Ir_<19>B_<16>. We measured the valence band structure of Mg_<10>Ir_<19>B_<16> 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.
社団法人日本物理学会の論文
2009-03-15