The Superconducting Gap in MgB_2: Electronic Raman Scattering Measurements of Single Crystals

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dc.creatorQuilty, J. W.
dc.creatorLee, S.
dc.creatorYamamoto, A.
dc.creatorTajima, S.
dc.date2001-07-11
dc.date2002-01-22
dc.date.accessioned2026-07-07T06:24:58Z
dc.date.available2026-07-07T06:24:58Z
dc.descriptionPolarisation-resolved Raman scattering measurements were performed on MgB_2 single crystals to determine the magnitude, symmetry and temperature dependence of the superconducting gap. A single sharp peak due to Cooper pair breaking appears in the electronic continuum below Tc, reaching an average maximum Raman shift of 105 +/- 1 cm^{-1} (2 Delta(0) / k_{B}Tc = 3.96 +/- 0.09) and showing up to 5 cm^{-1} anisotropy between polarised and depolarised spectra. The temperature dependence of 2 Delta follows that predicted from BCS theory, while the anisotropy decreases with decreasing temperature. It is concluded that the Raman results are consistent with a slightly anisotropic s-wave gap in a conventional BCS superconductor.
dc.description4 pages, 4 figures; revisions made to text and Figure 1. Accepted for publication in Physical Review Letters
dc.identifierhttps://arxiv.org/abs/cond-mat/0107216
dc.identifierhttp://arxiv.org/abs/cond-mat/0107216
dc.identifierPhys. Rev. Lett. 88, 087001 (2002)
dc.identifierdoi:10.1103/PhysRevLett.88.087001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/96722
dc.subjectSuperconductivity
dc.titleThe Superconducting Gap in MgB_2: Electronic Raman Scattering Measurements of Single Crystals
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