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X-ray absorption (XAS) and emission (XES) spectroscopy near B-K and C-K edgeshave been performed on metallic (~1at%B, B-diamond) and semiconducting(~0.1at%B and N, BN-diamond) doped-diamond films. Both B-K XAS and XES spectrashows metallic partial density of state (PDOS) with the Fermi energy of 185.3eV, and there is no apparent boron-concentration dependence in contrast to thedifferent electric property. In C-K XAS spectrum of B-diamond, the impuritystate ascribed to boron is clearly observed near the Fermi level. The Fermienergy is found to be almost same with the top of the valence band of non-dopeddiamond, E_V, 283.9 eV. C-K XAS of BN-diamond shows both the B-induced shallowlevel and N-induced deep-and-broad levels as the in-gap states, in which theshallow level is in good agreement with the activation energy (E_a=0.37 eV)estimated from the temperature dependence of the conductivity, namely thechange in C-2p PDOS of impurity-induced metallization is directly observed. Theelectric property of this diamond is mainly ascribed to the electronicstructure of C-2p near the Fermi level. The observed XES spectra are comparedwith the DVX-alpha cluster calculation. The DVX-alpha result supports thestrong hybridization between B-2p and C-2p observed in XAS and XES spectra, andsuggests that the small amount of borons (<1at%) in diamond occupy thesubstitutional site rather than interstitial site.Comment: submitted to Phys. Rev. B, 5 pages and 5 figure

physical review. b, condensed matter and materials physics

Electronic structures of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">B</mml:mi><mml:mspace width="0.2em" /><mml:mn>2</mml:mn><mml:mi>p</mml:mi></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:mspace width="0.2em" /><mml:mn>2</mml:mn><mml:mi>p</mml:mi></mml:mrow></mml:math>levels in boron-doped diamond films studied using soft…

Electronic structures ofB2pandC2plevels in boron-doped diamond films studied using soft…