Specific heat at the transition in a superconductor with fluctuating magnetic moments

Šimon Kos; Ivar Martin; C. M. Varma

doi:10.1103/PhysRevB.68.052507

← Back to search

Specific heat at the transition in a superconductor with fluctuating magnetic moments

Šimon Kos, Ivar Martin, C. M. Varma

DOI 10.1103/PhysRevB.68.052507 · 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

In the heavy-fermion materials CeCoIn5 and UBe13, the superconducting order parameter is coupled to fluctuating magnetization of the uncompensated part of the localized f moments. We find that this coupling decreases the superconducting transition temperature and increases the jump of the specific-heat coefficient, which indicates entropy transfer from the magnetic to the superconducting degree of freedom at the transition temperature. Below the transition, we find that the magnetic fluctuations are suppressed. We discuss the relation of our results to experiments on CeCoIn5 under pressure.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.3	Pressure unresolved	unknown
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.7	1.48 GPa	unknown
UBe13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown