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Science and Technology of Advanced Materials Volume 7, 2006 - Issue sup1: Superconductivity in Diamond and Related Materials, International Workshop on Superconductivity in Diamond and Related Materials. NIMS, Tsukuba, Japan, 7-9 December 2005. Edited by Yoshihiko Takano, Shinya Uji and Takehiko Mori
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Original Articles

Soft X-ray angle-resolved photoemission spectroscopy of heavily boron-doped superconducting diamond films

T. YokoyaThe Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Okayama, 700-8530, JapanCorrespondence[email protected]
,
T. NakamuraJapan Synchrotron Radiation Research Institute (JASRI)/Spring-8, 1-1-1 Kouto, Sayo, Hyogo, 679-5198, Japan
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T. MatushitJapan Synchrotron Radiation Research Institute (JASRI)/Spring-8, 1-1-1 Kouto, Sayo, Hyogo, 679-5198, Japan
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T. MuroJapan Synchrotron Radiation Research Institute (JASRI)/Spring-8, 1-1-1 Kouto, Sayo, Hyogo, 679-5198, Japan
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H. OkazakiThe Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Okayama, 700-8530, Japan
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M. AritaHiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima, 739-0046, Japan
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K. ShimadaHiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima, 739-0046, Japan
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H. NamatameHiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima, 739-0046, Japan
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M. TaniguchiHiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima, 739-0046, Japan
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Y. TakanoNational Institute for Material Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan
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M. NagaoNational Institute for Material Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan
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T. TakenouchiSchool of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, J169-8555, Japan
,
H. KawaradaSchool of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, J169-8555, Japan
&
I. OguchiDepartment of Quantum Matter, Graduate School of Advanced Sciences of Matter (ADSM), Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8530, Japan
 show all
Pages S12-S16 | Received 20 Jan 2006, Accepted 07 Feb 2006, Published online: 09 Aug 2006
 
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Abstract

We have performed soft X-ray angle-resolved photoemission spectroscopy (SXARPES) of microwave plasma-assisted chemical vapor deposition diamond films with different B concentrations in order to study the origin of the metallic behaviorof superconducting diamond. SXARPES results clearly show valence band dispersions with a bandwidth of ~ 23 eV and with a top of the valence band at gamma point in the Brillouin zone, which are consistent with the calculated valenceband dispersions of pure diamond. Boron concentration-dependent band dispersions near the Fermi level (Ef) exhibit asystematic shift of Ef, indicating depopulation of electrons due to hole doping. These SXARPES results indicate that diamond bands retain for heavy boron doping and holes in the diamond band are responsible for the metallic states leading to superconductivity at low temperature. A high-resolution photoemission spectroscopy spectrum near Ef of a heavily boron-doped diamond superconductor is also presented.

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