Effect of magnetic field on the two superconducting gaps in MgB2
Y. Bugoslavsky, Y. Miyoshi, G. K. Perkins, A. D. Caplin, L. F. Cohen, A. V. Pogrebnyakov, X. X. Xi
DOI 10.1103/PhysRevB.69.132508 · Physical Review B
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Abstract
Double-gap superconductivity in an epitaxial MgB2 film has been studied by means of point-contact spectroscopy in magnetic field up to 8 T. The relatively fast disappearance of the feature associated with the π-band gap at a field around 1 T is caused by the line broadening due to strong pair breaking rather than to a collapse of the double-gap state. This pair breaking was found to increase linearly with field. Field dependences of the order parameters Δπ and Δσ in π and σ bands were measured in field applied parallel and perpendicular to the film, at T=4.2K. In perpendicular field, both order parameters survive to a common Hc2, which is about 6.5 T for this direction. In parallel field, the decrease of the σ gap is much more gradual, consistent with the Hc2 being about 4 times greater in this orientation. The difference in Δπ measured in the two field orientations is however smaller than the difference of Δσ. We compare these results with the data on tunnelling spectroscopy and specific heat measurements of MgB2 single crystals and find consistency between the different measurements.
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. | 39 | Pressure not reported | onset |
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