Spin-triplet s-wave local pairing induced by Hund's rule coupling

TL;DR

This paper demonstrates that Hund's rule coupling in strongly correlated systems can induce local spin-triplet s-wave superconductivity through local fluctuation-mediated pairing, challenging conventional theories.

Contribution

It reveals a novel mechanism for spin-triplet s-wave pairing driven by Hund's rule coupling within dynamical mean field theory, emphasizing local multiplet interactions.

Findings

Hund's rule coupling induces local pairing superconductivity.

The resulting superconductivity is spin-triplet and s-wave.

Local fluctuations mediate the pairing mechanism.

Abstract

We show within the dynamical mean field theory that local multiplet interactions such as Hund's rule coupling produce local pairing superconductivity in the strongly correlated regime. Spin-triplet superconductivity driven by the Hund's rule coupling emerges from the pairing mediated by local fluctuations in pair exchange. In contrast to the conventional spin-triplet theories, the local orbital degrees of freedom has the anti-symmetric part of the exchange symmetry, leaving the spatial part as fully gapped and symmetric s-wave.