Energy gap in superconductors with singular asymmetric density of states

Journal Article · Sat Aug 01 04:00:00 EDT 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.46.3145· OSTI ID:7182652

Takacs, S ^[1]

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1. Institute of Electrical Engineering, Slovak Academy of Sciences, 842 39 Bratislava (Czechoslovakia)

The ratio {ital R}=2{Delta}{sub 0}/{ital kT}{sub {ital c}} is calculated for {delta}-function singularities in the density of states. Both symmetric and asymmetric densities of states are considered. In accordance with the symmetric powerlike singularities (D.C. Mattis and M. Molina, Phys. Rev. B 44, 12 565 (1991)), it is shown that neither the symmetric nor the asymmetric singularities in the density of states can explain those experimentally observed values in high-{ital T}{sub {ital c}} superconductors that are much higher than the BCS value of 3.52 in the weak-coupling limit.

• OSTI ID: 7182652
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 46:5; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BCS THEORY
ENERGY GAP
ENERGY-LEVEL DENSITY
HIGH-TC SUPERCONDUCTORS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE