Critical magnetic fluctuations induced superconductivity and residual density of states in $CeRhIn_5$ superconductor

Details Critical magnetic fluctuations induced superconductivity and residual density of states in $CeRhIn_5$ superconductor Critical magnetic fluctuations induced superconductivity and residual density of states in $CeRhIn_5$ superconductor

2002-01-17

arxiv.org/abs/cond-mat/0201315v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 figures

Scientific paper

10.1103/PhysRevB.66.224501

We propose the multiband extension of the spin-fermion model to address the superconducting d-wave pairing due to magnetic interaction near critical point. We solve the unrestricted gap equation with a general d-wave symmetry gap and find that divergent magnetic correlation length $\xi$ leads to the very unharmonic shape of the gap function with shallow gap regions near nodes. These regions are extremely sensitive to disorder. Small impurity concentration induces substantial residual density of states. We argue that we can understand the large $N_{res}(0) = \lim_{T\to 0} C_p(T)/T$ value and its pressure dependence of the recently discovered $CeRhIn_5$ superconductor under pressure within this approach.

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