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

Department of Physics

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

44 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

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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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

@article{7a6079ac3aa24764bc2989747a035dc8,

title = "Observation of a superconducting gap in boron-doped diamond by laser-excited photoemission spectroscopy",

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.",

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

year = "2007",

doi = "10.1103/PhysRevLett.98.047003",

language = "English",

volume = "98",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

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}

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

TY - JOUR

T1 - Observation of a superconducting gap in boron-doped diamond by laser-excited photoemission spectroscopy

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

N2 - 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.

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.

UR - https://www.scopus.com/pages/publications/33846527942

UR - https://www.scopus.com/pages/publications/33846527942#tab=citedBy

U2 - 10.1103/PhysRevLett.98.047003

DO - 10.1103/PhysRevLett.98.047003

M3 - Article

AN - SCOPUS:33846527942

SN - 0031-9007

VL - 98

JO - Physical review letters

JF - Physical review letters

IS - 4

M1 - 047003

ER -

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

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All Science Journal Classification (ASJC) codes

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