Composite spin and orbital triplet superconductivity

TL;DR

This paper demonstrates that the two-channel Anderson lattice model can induce unconventional superconductivity characterized by a composite order parameter involving local degrees of freedom and triplet pairs, with a non-analytic, odd-frequency gap.

Contribution

It introduces a new mechanism for superconductivity arising from a non Fermi-liquid phase in the two-channel Anderson lattice model, highlighting the role of composite order parameters.

Findings

Superconductivity peaks at half filling in the intermediate valence regime.

The gap function is non-analytic and odd in frequency.

A pseudo-gap forms in the conduction electron density of states.

Abstract

We show that the two-channel Anderson lattice model leads to the development of an unconventional superconductivity out of a metallic non Fermi-liquid phase. It is characterized by a composite order parameter comprising of a local spin or orbital degree of freedom bound to triplet Cooper pairs with an isotropic and a nearest neighbour form factor. The superconducting transition temperature is band filling dependent and peaks for half filling in the extrem intermediate valence regime and vanishes at integral valence. The gap function is non analytic and odd in frequency, and a pseudo-gap develops in the conduction electron density of states which vanishes as |omega| close to omega=0.