Valence band electronic structures of heavily boron-doped superconducting diamond studied by synchrotron photoemission spectroscopy

Takayoshi Yokoya^*, Tetsuya Nakamura, Tomohiro Matsushita, Takayuki Muro, Eiji Ikenaga, Masaaki Kobata, Keisuke Kobayashi, Yoshihiko Takano, Masanori Nagao, Tomohiro Takenouchi, Hiroshi Kawarada, Tamio Oguchi