Raman scattering measurement of the superconducting gap character in MgB2 single crystals

J. W. Quilty; S. Lee; A. Yamamoto; S. Tajima

doi:10.1016/S0921-4534(02)01378-3

Raman scattering measurement of the superconducting gap character in MgB₂ single crystals

J. W. Quilty, S. Lee, A. Yamamoto, S. Tajima

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

5 Citations (Scopus)

Abstract

Polarisation-resolved Raman scattering on MgB₂ single crystals reveals a sharp pair-breaking peak, which appears in the electronic continuum below T_c. This peak reaches an average maximum Raman shift of 105±1 cm^-1 (2Δ(0)/k_BT_c = 4.0 ± 0.1) and shows a small anisotropy of 2-5 cm^-1 as a function of polarisation. The temperature dependence follows that predicted from BCS theory and we find no evidence of a second gap feature below 2Δ. We conclude that the temperature dependence, polarisation dependence and magnitude of the superconducting gap observed by Raman scattering are consistent with a slightly anisotropic s-wave gap in a conventional BCS superconductor.

Original language	English
Pages (from-to)	38-42
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	378-381
Issue number	PART 1
DOIs	https://doi.org/10.1016/S0921-4534(02)01378-3
Publication status	Published - 2002 Oct 1
Externally published	Yes

Keywords

MgB
Raman spectroscopy
Superconducting gap

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/S0921-4534(02)01378-3

Cite this

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abstract = "Polarisation-resolved Raman scattering on MgB2 single crystals reveals a sharp pair-breaking peak, which appears in the electronic continuum below Tc. This peak reaches an average maximum Raman shift of 105±1 cm-1 (2Δ(0)/kBTc = 4.0 ± 0.1) and shows a small anisotropy of 2-5 cm-1 as a function of polarisation. The temperature dependence follows that predicted from BCS theory and we find no evidence of a second gap feature below 2Δ. We conclude that the temperature dependence, polarisation dependence and magnitude of the superconducting gap observed by Raman scattering are consistent with a slightly anisotropic s-wave gap in a conventional BCS superconductor.",

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T1 - Raman scattering measurement of the superconducting gap character in MgB2 single crystals

AU - Quilty, J. W.

AU - Lee, S.

AU - Yamamoto, A.

AU - Tajima, S.

PY - 2002/10/1

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N2 - Polarisation-resolved Raman scattering on MgB2 single crystals reveals a sharp pair-breaking peak, which appears in the electronic continuum below Tc. This peak reaches an average maximum Raman shift of 105±1 cm-1 (2Δ(0)/kBTc = 4.0 ± 0.1) and shows a small anisotropy of 2-5 cm-1 as a function of polarisation. The temperature dependence follows that predicted from BCS theory and we find no evidence of a second gap feature below 2Δ. We conclude that the temperature dependence, polarisation dependence and magnitude of the superconducting gap observed by Raman scattering are consistent with a slightly anisotropic s-wave gap in a conventional BCS superconductor.

AB - Polarisation-resolved Raman scattering on MgB2 single crystals reveals a sharp pair-breaking peak, which appears in the electronic continuum below Tc. This peak reaches an average maximum Raman shift of 105±1 cm-1 (2Δ(0)/kBTc = 4.0 ± 0.1) and shows a small anisotropy of 2-5 cm-1 as a function of polarisation. The temperature dependence follows that predicted from BCS theory and we find no evidence of a second gap feature below 2Δ. We conclude that the temperature dependence, polarisation dependence and magnitude of the superconducting gap observed by Raman scattering are consistent with a slightly anisotropic s-wave gap in a conventional BCS superconductor.

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KW - Superconducting gap

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