Magneto-optical reflectivity of superconducting MgB2 single crystals

Details Magneto-optical reflectivity of superconducting MgB2 single crystals Magneto-optical reflectivity of superconducting MgB2 single crystals

2002-05-28

arxiv.org/abs/cond-mat/0205596v1

Phys. Rev. Lett. 89, 097001 (2002)

Physics

Condensed Matter

Superconductivity

6 pages (3 text-pages, 3 figures), submitted to PRL

Scientific paper

10.1103/PhysRevLett.89.097001

We present magneto-optical reflectivity results in the basal-plane of the hexagonal $MgB_2$. The data were collected on a mosaic of $MgB_2$ single crystals with $T_{c}=38 ~K$ 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 $2\Delta/k_{B}T_{c}\sim 1.2$, 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 $H_{c2}$ along the c-axis. The temperature dependence of $H_{c2}$ is compatible with the Helfand-Werthamer behaviour.

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