Critical magnetic-fluctuations-induced superconductivity and residual density of states in the CeRhIn5 superconductor

Yunkyu Bang; I. Martin; A. V. Balatsky

doi:10.1103/PhysRevB.66.224501

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Critical magnetic-fluctuations-induced superconductivity and residual density of states in the CeRhIn5 superconductor

Yunkyu Bang, I. Martin, A. V. Balatsky

DOI 10.1103/PhysRevB.66.224501 · Physical Review B

T1

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Abstract

We propose a multiband extension of the spin-fermion model to address the superconducting d-wave pairing due to magnetic interaction near the critical point. We solve the unrestricted gap equation with a general d-wave symmetry gap, and find that the divergent magnetic correlation length ξ leads to the very unharmonic shape of the gap function with shallow gap regions near the nodes. These regions are extremely sensitive to disorder. A small impurity concentration induces a substantial residual density of states. We argue that we can understand the large Nres(0)=limopT→0Cp(T)/T value and its pressure dependence of the recently discovered CeRhIn5 superconductor under pressure within this approach.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CeRhIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown