Evidence for Two Superconducting Gaps in MgB2
X. K. Chen, M. J. Konstantinović, J. C. Irwin, D. D. Lawrie, J. P. Franck
DOI 10.1103/PhysRevLett.87.157002 · Physical Review Letters
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Abstract
We have measured the Raman spectra of polycrystalline MgB2 from 25 to 1200cm−1. A superconductivity-induced redistribution in the electronic Raman continuum was observed. Two pair-breaking peaks appear in the spectra, suggesting the presence of two superconducting gaps. The measured spectra were analyzed using a quasi-two-dimensional model in which two s-wave superconducting gaps open on two sheets of Fermi surface. For the gap values we have obtained Δ1=22cm−1 ( 2.7meV) and Δ2=50cm−1 ( 6.2meV). Our results suggest that a conventional phonon-mediated pairing mechanism occurs in the planar boron σ bands and is responsible for the superconductivity of MgB2.
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. | 38.75 | Pressure not reported | onset |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.75 | Pressure not reported | onset |
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