Magneto-Optical Study of the Superconducting Gap of MgB2 Single Crystals
A. Perucchi, L. Degiorgi, J. Jun, M. Angst, J. Karpinski
DOI 10.1103/PhysRevLett.89.097001 · Physical Review Letters
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Abstract
We present magneto-optical reflectivity results in the basal plane of the hexagonal MgB2. The data were collected on a mosaic of MgB2 single crystals with Tc=38 K from the ultraviolet down to the far infrared as a function of temperature and magnetic field oriented along the c axis. In the far infrared, there is a clear signature of the superconducting gap with a gap ratio 2Δ/kBTc∼1.2, well below the weak-coupling value. The gap is suppressed in an external magnetic field, which is a function of temperature. We extract the upper critical field Hc2 along the c axis. The temperature dependence of Hc2 is compatible with the Helfand-Werthamer behavior.
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 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
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