Electronic Structure of Noncentrosymmetric Superconductor Li_2(Pd_xPt_<1-x>)_3B Studied by Photoemission Spectroscopy(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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We have performed x-ray photoemission spectroscopy on the system of noncentrosymmetric superconductor, Li_2(Pd_xPt_<1-x>)_3B. For Li_2Pt_3B, we found two major peaks with two other weak components, and the band calculations were in agreement with the observation. The assignment of valence band features using the calculated partial density of states determined that Pt 5d and B 2p contribute to the density of states at the Fermi level. The effect of antisymmetric spin-orbit coupling on the band structure might have been probed, and the analysis on the effect of Pt incorporation into the system indicates the smooth evolution of electronic structures. We presented the measurements of core levels (Pd 3d, Pt 4f, and B 1s) and discussed the chemical bonding states and electronic structures from them.
社団法人日本物理学会の論文
2008-10-15