Determination of the electron-paramagnon coupling parameter of a transition metal from superconducting tunneling experiments

Journal Article · Tue Mar 01 04:00:00 EST 1983 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.27.2812· OSTI ID:6055643

Leavens, C R; MacDonald, A H

In a recent paper Burnell et al. presented a novel method of analysis for obtaining experimental estimates of the electron-phonon and electron-paramagnon coupling parameters lambda/sub ph/ and lambda/sub s/, respectively, for transition metals. Their analysis provides convincing evidence for strong paramagnon suppression of T/sub c/ in Nb and V. We show that this analysis can be improved by removing two unnecessary assumptions each of which can have a significant effect on the determination of lambda/sub s/. The experimental uncertainty in the estimate of lambda/sub s/ then depends primarily on uncertainties in the characteristic paramagnon frequency ..cap omega../sub s/ and the usual Coulomb interaction parameter ..mu../sub ph/(. We calculate lambda/sub s/ for a reasonable range of values for these parameters and obtain estimates of lambda/sub s/ that are a factor of approx.2 larger than those of Burnell et al. for the same choice of ..mu../sub ph/( and ..cap omega../sub s/approx.1 eV.

• Research Organization: Division of Physics, National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada
• OSTI ID: 6055643
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 27:5; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANGULAR MOMENTUM
COULOMB FIELD
ELECTRIC CONDUCTIVITY
ELECTRIC FIELDS
ELECTRICAL PROPERTIES
ELECTRON-PHONON COUPLING
ELEMENTS
FERROMAGNETIC MATERIALS
FLUCTUATIONS
MAGNETIC MATERIALS
MATERIALS
METALS
NIOBIUM
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
SPIN
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
VANADIUM
VARIATIONS