Phenomenology of the superconducting state of a marginal Fermi liquid with BCS model interaction

M. L. Horbach; F. L. J. Vos; W. van Saarloos

doi:10.1103/PhysRevB.48.4061

← Back to search

Phenomenology of the superconducting state of a marginal Fermi liquid with BCS model interaction

M. L. Horbach, F. L. J. Vos, W. van Saarloos

DOI 10.1103/PhysRevB.48.4061 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We study the effect of an additional simple BCS model interaction in a system in which the dominant scattering causes marginal-Fermi-liquid (MFL) behavior. It leads to a superconductor that shows a number of unusual features as compared to weak-coupling BCS superconductors. The superconducting transition temperature is lowered due to the MFL pair-breaking effects. If the bosonic mode that causes the MFL behavior, and which presumably is of electronic origin, is largely suppressed below Tc due to the gap opening up, Δ(0) remains practically unaffected by the MFL behavior. As a result, the ratio 2Δ(0)/kBTc is enhanced, and the gap opens up much more rapidly than in the standard BCS approximation; even a gap discontinuity at Tc is possible. Furthermore, we find a suppression of the coherence peak in the nuclear-spin-relaxation rate and a more dramatic decrease below Tc of the ultrasonic attenuation rate and the penetration depth.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown