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

K. Ishizaka, R. Eguchi, S. Tsuda, T. Yokoya, A. Chainani, T. Kiss, T. Shimojima, T. Togashi, S. Watanabe, C. T. Chen, C. Q. Zhang, Y. Takano, M. Nagao, I. Sakaguchi, T. Takenouchi, H. Kawarada, S. Shin

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Abstract

We investigate the temperature (T)-dependent low-energy electronic structure of a boron-doped diamond thin film using ultrahigh resolution laser-excited photoemission spectroscopy. We observe a clear shift of the leading edge below T=11K, indicative of a superconducting gap opening (Δ∼0.78meV at T=4.5K). The gap feature is significantly broad and a well-defined quasiparticle peak is lacking even at the lowest temperature of measurement (=4.5K). We discuss our results in terms of disorder effects on the normal state transport and superconductivity in this system.

Original languageEnglish
Article number047003
JournalPhysical Review Letters
Volume98
Issue number4
DOIs
Publication statusPublished - 2007 Jan 30

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Ishizaka, K., Eguchi, R., Tsuda, S., Yokoya, T., Chainani, A., Kiss, T., Shimojima, T., Togashi, T., Watanabe, S., Chen, C. T., Zhang, C. Q., Takano, Y., Nagao, M., Sakaguchi, I., Takenouchi, T., Kawarada, H., & Shin, S. (2007). Observation of a superconducting gap in boron-doped diamond by laser-excited photoemission spectroscopy. Physical Review Letters, 98(4), [047003]. https://doi.org/10.1103/PhysRevLett.98.047003