Theory of pairing in mixed-valent correlated metals
arXiv:2007.04373 · doi:10.1103/PhysRevB.102.214509
Abstract
Motivated by the recent discovery of superconductivity in square-planar nickelates as well as by longstanding puzzling experiments in heavy-fermion superconductors, we study Cooper pairing between correlated -electrons coupled to a band of weakly-correlated electrons. We perform self-consistent large N calculations on an effective model for the -electrons with additional hybridization. Unlike previous studies of mixed-valent systems, we focus on parameter regimes where both hybridized bands are relevant to determining the pairing symmetry. For sufficiently strong hybridization, we find a robust pairing which breaks time-reversal and point-group symmetries in the mixed-valent regime. Our results illustrate how intrinsically multi-band systems such as heavy-fermions can support a number of highly non-trivial pairing states. They also provide a putative microscopic realization of previous phenomenological proposals of pairing and suggest a potential resolution to puzzling experiments in heavy-fermion superconductors such as UThBe which exhibit two superconducting phase transitions and a full gap at lower temperatures.
arXiv comment13 pages, 13 figures
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