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

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

2006-04-14

arxiv.org/abs/cond-mat/0604370v1

Phys. Rev. Lett. 98, 047003 (2007)

Physics

Condensed Matter

Superconductivity

12 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.98.047003

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.

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