Correlation-driven multigap d-wave superconductivity in Anderson lattice model

TL;DR

This paper presents a Gutzwiller-wave-function solution for the Anderson lattice model, revealing a correlation-driven multigap d-wave superconducting ground state consistent with properties of CeCoIn$_5$ and other heavy-fermion superconductors.

Contribution

It introduces a full Gutzwiller-wave-function approach to the Anderson lattice model, demonstrating a universal pairing mechanism for heavy-fermion superconductors.

Findings

Identification of a multigap d-wave superconducting state

Consistency with properties of CeCoIn$_5$

Kinetic energy gain in the superconducting state

Abstract

We present the full Gutzwiller-wave-function solution of the Anderson lattice model in two dimensions that leads to the correlation-driven multigap superconducting (SC) ground state with the dominant $d_{x^2-y^2}$-wave symmetry. The results are consistent with the principal properties of the heavy-fermion superconductor CeCoIn$_5$. We regard the pairing mechanism as universal and thus applicable to other Ce-based heavy-fermion compounds. Additionally, a gain in kinetic energy in the SC state takes place, as is also the case for high-temperature superconductors.