Dependence of superconducting thermodynamics ratios on the shape of the electron-phonon spectral density

Journal Article · Tue Nov 01 00:00:00 EST 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.38.8697· OSTI ID:6719169

Coombes, J M; Carbotte, J P

We have extended a previous study of the effect of the shape of the electron-phonon spectral density ..cap alpha../sup 2/F(..cap omega..) on the ratio 2..delta../sub 0//k/sub B/T/sub c/ to include the thermodynamic indices ..gamma../sub s/(T/sub c//H/sub c/(0))/sup 2/, ..delta..C/sub v//..gamma../sub s/T/sub c/, and the critical magnetic field deviation D(t). Using realistic shapes, we find small variations which are relatively larger in these ratios than was the case with 2..delta../sub 0//k/sub B/T/sub c/. The analysis is extended to a two-delta-function model spectrum to investigate the range of values taken on by these quantities when the shape of ..cap alpha../sup 2/F(..cap omega..) is left relatively unconstrained.

• Research Organization: Department of Physics, McMaster University, Hamilton, Ontario, Canada L8Schemically bond4M1
• OSTI ID: 6719169
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 38:13
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
SUPERCONDUCTIVITY
ELECTRON-PHONON COUPLING
THERMODYNAMICS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
CRITICAL FIELD
MATHEMATICAL MODELS
SPECTRAL DENSITY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FUNCTIONS
MAGNETIC FIELDS
PHYSICAL PROPERTIES
SPECTRAL FUNCTIONS
656100* - Condensed Matter Physics- Superconductivity