Quenched-impurity and magnetic-field effects on the phase transition in unconventional superconductors

Journal Article · Tue Jan 01 04:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.1150· OSTI ID:6049519

Busiello, G; De Cesare, L ^[1]; Millev, Y T ^[2]; Rabuffo, I ^[3]; Uzunov, D I ^[4]

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1. Dipartimento di Fisica Teorica e sue Metodologie per le Scienze Applicate e Istituto Nazionale di Fisica della Materia, Universita degli Studi di Salerno, I-84100 Salerno, Italy (IT)
2. Department of Physics, Higher Institute of Mechanical and Electrical Engineering, BG-1504 Sofia (Bulgaria)
3. Dipartimento di Fisica Teorica e sue Metodologie per le Scienze Applicate e Istituto Nazionale di Fisica della Materia, Universita degli Studi di Salerno, I-84100 Salerno, (Italy)
4. George Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, BG-1784 Sofia, (Bulgaria)

The combined influence of crystal anisotropy, magnetic fluctuations, and quenched randomness upon the critical behavior of unconventional superconductors is studied by means of the renormalization-group analysis within the {epsilon} expansion. The fixed points of the renormalization-group equations are presented and their properties investigated to first order in {epsilon}=4{minus}{ital d}. Because of the crystal-field anisotropy, no stable fixed points exist and the main conclusion is that only fluctuation-driven first-order transitions should occur in unconventional superconductors in the vicinity of the critical point.

• OSTI ID: 6049519
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:1; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
CRYSTAL FIELD
FLUCTUATIONS
GINZBURG-LANDAU THEORY
IMPURITIES
MAGNETIC FIELDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
VARIATIONS