Random-field-like disorder and magnetic-field effects in unconventional superconductors

Journal Article · Wed May 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.10555· OSTI ID:5589260

De Cesare, L ^[1]

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1. Dipartimento di Fisica Teorica e sue Metodologie per le Scienze Applicate, Istituto Nazionale di Fisica della Materia, Universita di Salerno, 84100 Salerno, Italy (IT)

The effects of short-range correlated random-field-like disorder and magnetic-field fluctuations in a generalized {ital d}-dimensional Ginzburg-Landau model of unconventional superconductors are investigated by means of the renormalization-group approach to first order in {epsilon}=6{minus}{ital d}. It is found that the quenched disorder, in competition with the combined action of crystal anisotropies and magnetic fluctuations, does not create stable fixed points for {ital d}{lt}6, indicating an absence of the usual second-order phase transitions. The unstable physical fixed points may govern fluctuation-induced first-order transitions, but superconducting glass states associated with the symmetry-breaking disorder cannot be excluded {ital a} {ital priori}.

• OSTI ID: 5589260
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:13; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
COOPER PAIRS
CORRELATIONS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
GINZBURG-LANDAU THEORY
MAGNETIC FIELDS
ORTHORHOMBIC LATTICES
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY