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

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

2005-09-09

arxiv.org/abs/cond-mat/0509244v1

Europhysics Letters 72(4), 638 (2005)

Physics

Condensed Matter

Superconductivity

Submitted to Europhysics Letters

Scientific paper

10.1209/epl/i2005-10269-9

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.

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