Interpretation of the temperature dependence of the electromagnetic penetration depth in YBa sub 2 Cu sub 3 O sub 7 minus. delta
- Physics Department, The Pennsylvania State University, 104 Davey Laboratory, University Park, Pennsylvania 16802 (US)
- Department of Physics and Science and Technology Center for Superconductivity, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801 (USA)
The low-temperature behavior of the {ital a}-{ital b} plane penetration depth, {lambda}{sub {ital a}{ital b}}, is a probe of the pairing state in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. A group-theoretic analysis shows that in orthorhombic or tetragonal crystals {ital all} singlet pairing states other than {ital s} wave'' would lead to {Delta}{lambda}{sub {ital a}{ital b}}({ital T})=={lambda}{sub {ital a}{ital b}}({ital T}){minus}{lambda}{sub {ital a}{ital b}}(0){similar to}{ital T}. In contrast, for an isotropic system, there are combinations of singlet pairing states and field directions that would give rise to {Delta}{lambda}({ital T}){similar to}{ital T}{sup 3}. We reanalyze the surface impedance data of Fiory {ital et} {ital al}. (Phys. Rev. Lett. 61, 1419 (1988)), and show that these data exhibit neither a BCS temperature dependence nor a linear temperature dependence at low temperature, but instead follow {Delta}{lambda}{sub {ital a}{ital b}}({ital T}){similar to}{ital T}{sup 2}. This behavior is probably not intrinsic, and possible explanations are discussed.
- OSTI ID:
- 5734985
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:4; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
FILMS
HIGH-TC SUPERCONDUCTORS
OXIDES
OXYGEN COMPOUNDS
PENETRATION DEPTH
SUPERCONDUCTORS
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES