| Issue |
Europhys. Lett.
Volume 72, Number 4, November 2005
|
|
|---|---|---|
| Page(s) | 638 - 644 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2005-10269-9 | |
| 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
Received:
13
September
2005
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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