Evidence for Two Superconducting Energy Gaps in MgB2 by Point-Contact Spectroscopy

Experimental support is found for the multiband model of the superconductivity in the recently discovered system ${\mathrm{MgB}}_{2}$ with the transition temperature ${T}_{c}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}39\mathrm{K}$. By means of Andreev reflection, evidence is obtained for two... View More