Microwave Response of V3Si Single Crystals: Evidence for Two-Gap Superconductivity

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.

arXiv commentSubmitted to Europhysics Letters

References in corpus (5)

• Two-gap superconductivity in MgB${}_2$: clean or dirty?
• Heat Conduction in the Vortex State of NbSe_2: Evidence for Multi-Band Superconductivity
• Specific heat of Nb_3Sn: The case for a second energy gap
• Anomalous microwave conductivity coherence peak in c-axis MgB2 thin film
• Anisotropic s-wave superconductivity: comparison with experiments on MgB2 single crystals

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