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

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arxiv cond-mat/0410144 v3 pith:X3JVUKNO submitted 2004-10-06 cond-mat.supr-con

Jin Nakamura , Tamio Oguchi , Nobuyoshi Yamada , Kazuhiko Kuroki , Kozo Okada , Yoshihiko Takano , Masanori Nagao , Isao Sakaguchi
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Hiroshi Kawarada Rupert C.C. Perera David L. Ederer
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classification cond-mat.supr-con
keywords bandvalencestatessuperconductingabsorptionboron-dopeddiamondemission
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abstract

Carbon- and boron-2$p$ states of superconducting and non-superconducting boron-doped diamond samples are measured using soft X-ray emission and absorption spectroscopy. For the superconducting sample, a large density of hole states is observed in the valence band in addition to the states in the impurity band. The hole states in the valence band is located at about 1.3 eV below the valence band maximum regardless of the doping level, which cannot be interpreted within a simple rigid band model. Present experimental results, combined with the first principles calculations, suggest that superconductivity is to be attributed to the holes in the valence band.

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