Superconducting energy gap in a MgB2 film observed by infrared reflectance
A. Pimenov, A. Loidl, S. I. Krasnosvobodtsev
DOI 10.1103/PhysRevB.65.172502 · Physical Review B
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Abstract
Far-infrared reflectance of a MgB2 film has been measured by Fourier-transform spectroscopy for frequencies 10 cm−1<ν<4000 cm−1 above and below the superconducting transition. The data provide clear experimental evidence for the onset of a superconducting gap at 24 cm−1 at T=5 K. On increasing the temperature the gap energy increases, contrary to what is expected in isotropic BCS superconductors. The small zero-temperature gap value and its unconventional increases on increasing temperature can only be explained by a highly anisotropic or multiple gap function.
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. | 32 | Pressure not reported | onset |
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