Evidence of two-gap s-wave superconductivity in YBa sub 2 Cu sub 3 O sub 7 sub - sub x from microwave surface impedance measurements

Evidence of two-gap s-wave superconductivity in YBa sub 2 Cu sub 3 O sub 7 sub - sub x from microwave surface impedance measurements

Microwave surface resistance and magnetic field penetration exhibit a weak exponential temp. dependence below 30 K, corresponding to an energy gap of approximately 6 meV. Then the penetration depth exhibits a small bump at approximately 60 K, which is consistent with a two-band BCS calculation using...

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Bibliographic Details
Published in:Physical review letters Vol. 71; no. 20; pp. 3355 - 3358
Main Authors: Klein, N, Tellmann, N, Schulz, H, Urban, K, Wolf, S A, Kresin, V Z
Format: Journal Article
Language:English
Published: 01-01-1993
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Summary:Microwave surface resistance and magnetic field penetration exhibit a weak exponential temp. dependence below 30 K, corresponding to an energy gap of approximately 6 meV. Then the penetration depth exhibits a small bump at approximately 60 K, which is consistent with a two-band BCS calculation using 6 meV for the smaller gap.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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ObjectType-Feature-1
ISSN:0031-9007