Holes in the valence band of superconducting boron-doped diamond film studied by soft X-ray absorption and emission spectroscopy

Jin Nakamura, Tamio Oguchi, Nobuyoshi Yamada, Kazuhiko Kuroki, Kozo Okada, Yoshihiko Takano, Masanori Nagao, Isao Sakaguchi, Hiroshi Kawarada, Rupert C.C. Perera, and David L. Ederer Department of Applied Physics & Chemistry, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan Department of Quantum Matter, ADSM, Hiroshima University, Higashihiroshima, Hiroshima 739-8530, Japan Department of Physics, Okayama University, Tsushima-naka, Okayama 700-8530, Japan National Institute for Materials Science, Tsukuba, Ibaraki 305-0047 Japan School of Science and Engineering, Waseda University, Shinjyuku-ku, Tokyo, 169-8555, Japan Center for X-ray Optics, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA and Department of Physics, Tulane University, New Orleans, Louisiana 70118, USA (Dated: October 13, 2004)