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

doi:10.1103/PhysRevLett.98.047003

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

^*Corresponding author for this work

School of Fundamental Science and Engineering

Research output: Contribution to journal › Article › peer-review

43 Citations (Scopus)

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 language	English
Article number	047003
Journal	Physical Review Letters
Volume	98
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.98.047003
Publication status	Published - 2007

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.98.047003

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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), Article 047003. https://doi.org/10.1103/PhysRevLett.98.047003

Ishizaka, K, Eguchi, R, Tsuda, S, Yokoya, T, Chainani, A, Kiss, T, Shimojima, T, Togashi, T, Watanabe, S, Chen, CT, Zhang, CQ, 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, vol. 98, no. 4, 047003. https://doi.org/10.1103/PhysRevLett.98.047003

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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.",

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AU - Ishizaka, K.

AU - Eguchi, R.

AU - Tsuda, S.

AU - Yokoya, T.

AU - Chainani, A.

AU - Kiss, T.

AU - Shimojima, T.

AU - Togashi, T.

AU - Watanabe, S.

AU - Chen, C. T.

AU - Zhang, C. Q.

AU - Takano, Y.

AU - Nagao, M.

AU - Sakaguchi, I.

AU - Takenouchi, T.

AU - Kawarada, H.

AU - Shin, S.

PY - 2007

Y1 - 2007

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AB - 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.

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

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