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We present results of the optical reflectivity in the basal-plane of the hexagonal MgB 2 superconductor. 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 (FIR) as a function of temperature as well as of magnetic field oriented along the c-axis. In the FIR there is a clear signature of the superconducting...
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