Superconducting Instability in the Periodic Anderson Model

TL;DR

This study uses quantum Monte Carlo simulations to identify a superconducting instability in the normal state of the infinite dimensional periodic Anderson model, revealing a non-Fermi liquid phase with a reentrant phase diagram.

Contribution

It demonstrates the emergence of superconductivity from a non-Fermi liquid normal state in the periodic Anderson model using advanced simulation techniques.

Findings

Superconductivity arises from a non-Fermi liquid state.

The phase diagram shows reentrant behavior due to competing phases.

The superconducting order parameter has nodes in frequency.

Abstract

Employing a quantum Monte Carlo simulation we find a pairing instability in the normal state of the infinite dimensional periodic Anderson model. Superconductivity arises from a normal state in which the screening is protracted and which is clearly not a Fermi liquid. The phase diagram is reentrant reflecting competition between superconductivity and Fermi liquid formation. The estimated superconducting order parameter is even, but has nodes as a function of frequency. This opens the possibility of a temporal node and an effective order parameter composed of charge pairs and spin excitations.