Abstract
We present the first results of point-contact spectroscopy (PCS) in single crystals of the boride superconductorZrB12. The material was first characterized by AC susceptibility and resistivity measurementsthat allowed us to determine several quantities of physical interest. Then we performedpoint-contact measurements that gave conductance curves with clear Andreev-reflectionfeatures typical of an s-wave single-gap superconductor. By measuring these conductancecurves at various temperatures and in the presence of magnetic fields, weobtained the temperature dependence of the gap and of the upper critical field ofZrB12, as well as an estimate of the Fermi energy. All the results indicate thatZrB12 is a conventional s-wave weak coupling superconductor.
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