Photoemission Spectroscopy on the System of Noncentrosymmetric Lithium Ternary Borides*

We performed x-ray photoemission spectroscopy at BL27SU of SPring-8 on polycrystalline samples of Li$_{2}$Pd$_{1.5}$Pt$_{1.5}$B and Li$_{2}$Pt$_{3}$B prepared by the arc melting method. We also employed a polycrystalline platinum plate commercially available for comparison. We also performed the calculation of valence band structure of Li$_{2}$Pt$_{3}$B using full-potential augmented plane wave method with local density approximation. Our experimental data on the samples and the previous photoemission study on Li$_{2}$Pd$_{3}$B support that electron correlations do not play an important role in them.