Superconducting Gap in MgB2: Electronic Raman Scattering Measurements of Single Crystals
J. W. Quilty, S. Lee, A. Yamamoto, S. Tajima
DOI 10.1103/PhysRevLett.88.087001 · Physical Review Letters
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Abstract
Polarization-resolved Raman scattering measurements were performed on MgB2 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 a maximum Raman shift of 105±1cm−1 [2Δ(0)/kBTc=3.96±0.09] and showing up to 5cm−1 anisotropy between polarized and depolarized spectra. The temperature dependence of 2Δ 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.2 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.2 | Pressure not reported | unknown |
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