Volume 72, Number 4, November 2005
|Page(s)||638 - 644|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||12 October 2005|
Microwave response of single crystals: Evidence for two-gap superconductivity
Institute of Solid State Physics - 142432 Chernogolovka, Moscow district, Russia
Accepted: 16 September 2005
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 the two-band model of superconductivity, thus strongly evidencing the existence of two distinct energy gaps with zero-temperature values and in .
PACS: 74.25.Nf – Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.) / 74.70.Ad – Metals; alloys and binary compounds (including A15, , etc.)
© EDP Sciences, 2005
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