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

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

2001-07-11

arxiv.org/abs/cond-mat/0107216v2

Phys. Rev. Lett. 88, 087001 (2002)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures; revisions made to text and Figure 1. Accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.88.087001

Polarisation-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.

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