Correlation-driven d-wave superconductivity in Anderson lattice model: Two gaps

Marcin M. Wysokiński; Jan Kaczmarczyk; Józef Spałek

doi:10.1103/PhysRevB.94.024517

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Correlation-driven d-wave superconductivity in Anderson lattice model: Two gaps

Marcin M. Wysokiński, Jan Kaczmarczyk, Józef Spałek

DOI 10.1103/PhysRevB.94.024517 · Physical Review B

T1

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Abstract

Superconductivity in heavy-fermion systems has an unconventional nature and is considered to originate from the universal features of the electronic structure. Here, the Anderson lattice model is studied by means of the full variational Gutzwiller wave function incorporating nonlocal effects of the on-site interaction. We show that the d-wave superconducting ground state can be driven solely by interelectronic correlations. The proposed microscopic mechanism leads to a multigap superconductivity with the dominant contribution due to f electrons and in the dx2−y2-wave channel. Our results rationalize several important observations for CeCoIn5.

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.	—	Pressure not reported	unknown
CeCu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown