Observation of superconducting gap in boron-doped diamond by laser-excited photoemission spectroscopy

Abstract

We have investigated the low energy electronic state of a boron-doped diamond thin film by the ultrahigh resolution laser-excited photoemission spectroscopy. We observed a clear shift of the leading edge below 11 K indicative of a superconducting gap opening ($\Delta \sim 0.78$ meV at 4.5 K). The gap feature is significantly broad and the well-defined quasiparticle peak is not recognizable even at the lowest temperature of measurement 4.5 K. We discuss our result in terms of possible disorder effect on superconductivity in this system.

12 pages, 4 figures

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• Superconductivity in CVD Diamond Thin Film Well-Above Liquid Helium Temperature
• Three-dimensional MgB${}_2$-type superconductivity in hole-doped diamond
• Origin of Superconductivity in Boron-doped Diamond
• Electron-Phonon Coupling in Boron-Doped Diamond Superconductor
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