Microwave Response of V3Si Single Crystals: Evidence for Two-Gap Superconductivity
arXiv:cond-mat/0509244 · doi:10.1209/epl/i2005-10269-9
Abstract
The investigation of the temperature dependences of microwave surface impedance and complex conductivity of V3Si single crystals with different stoichiometry allowed to observe a number of peculiarities which are in remarkable contradiction with single-gap Bardeen-Cooper-Schrieffer theory. At the same time, they can be well described by two-band model of superconductivity, thus strongly evidencing the existence of two distinct energy gaps with zero-temperature values Delta1~1.8Tc and Delta2~0.95Tc in V3Si.
Submitted to Europhysics Letters