Dependence of the critical temperature and energy gap of superconductors on a singularity in the density of states

Journal Article · Mon Nov 01 04:00:00 EST 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.13127· OSTI ID:5920882

Takacs, S ^[1]

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1. Institute of Electrical Engineering, Slovak Academy of Sciences, 84239 Bratislava, Slovakia ( )

It is shown how the critical temperature and zero-temperature energy gap decrease by shifting the position of the singularity in the density of states (DOS) with respect to the Fermi energy. The enhancement of the critical temperature due to the singularity (compared with the constant DOS near the Fermi surface) is not as large for strong-coupling superconductors as in the weak-coupling limit. Hence, the singularity in the DOS cannot be the exclusive reason for large values of critical temperatures in high-[ital T][sub [ital c]] superconductors.

• OSTI ID: 5920882
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:17; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BCS THEORY
COOPER PAIRS
COUPLING
ENERGY GAP
ENERGY LEVELS
ENERGY-LEVEL DENSITY
FERMI LEVEL
PHYSICAL PROPERTIES
SINGULARITY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE