Ginzburg-Landau theory of the upper critical field in filamentary superconductors
The upper critical field for coupled filamentary superconductors is analyzed within the context of a Ginzburg-Landau theory similar to the Lawrence-Doniach theory for coupled layered superconductors. Upward curvature in the critical field as the temperature is lowered results from the decreased coupling of the filaments, and an ultimate divergence in the critical field at all angles occurs below a decoupling temperature T*. Unusual anomalies are predicted to occur in the H/sub c/2parallel(T) curve, corresponding to a commensurate fitting of the vortices into the filament lattice. The behavior of H/sub c2/ for coupled filaments is contrasted with that of an isolated fibre of finite diameter. The model is applied to (SN)/sub x/, to the transition-metal trichalcogenides NbSe/sub 3/ and TaSe/sub 3/, and to mercury embedded in asbestos.
- Research Organization:
- Department of Physics, Stanford University, Stanford, California 94305
- OSTI ID:
- 6307308
- Journal Information:
- Phys. Rev., Sect. B. Condens. Matter; (United States), Vol. 19:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
GINZBURG-LANDAU THEORY
CRITICAL FIELD
MERCURY
NIOBIUM SELENIDES
SULFUR NITRIDES
SUPERCONDUCTING WIRES
TANTALUM SELENIDES
ASBESTOS
ONE-DIMENSIONAL CALCULATIONS
SUPERCONDUCTIVITY
CHALCOGENIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
MAGNETIC FIELDS
METALS
NIOBIUM COMPOUNDS
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
SELENIDES
SELENIUM COMPOUNDS
SULFUR COMPOUNDS
TANTALUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
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656101* - Solid State Physics- Superconductivity- General Theory- (-1987)
360104 - Metals & Alloys- Physical Properties