Spin-Triplet Superconductivity Induced by All-In-All-Out Spin Fluctuation in Pyrochlore Electronic System

TL;DR

This paper investigates how AIAO spin fluctuations in a pyrochlore system can induce spin-triplet superconductivity, revealing a novel pairing mechanism driven by specific spin-cluster susceptibilities.

Contribution

It demonstrates that AIAO spin fluctuations can lead to spin-triplet superconductivity in a pyrochlore lattice, a new insight into pairing mechanisms in such systems.

Findings

AIAO spin-cluster susceptibility diverges at q=0 for negative spin-orbit coupling.

Spin-triplet superconductivity is mediated by AIAO spin fluctuations.

No superconductivity observed for spin-singlet pairing.

Abstract

We study the symmetry of superconductivity around the All-In-All-Out (AIAO) spin ordered phase in a nearly half-filled pyrochlore electronic system. The electronic system is described by the Hubbard model with an anti-symmetric spin-orbit coupling. The AIAO spin ordered state is formed by arranging tetrahedral hedgehog spin-clusters uniformly in the lattice system, where 12 types of spin-clusters are allowed in a unit cell. All spin-cluster susceptibilities are calculated within the random phase approximation with respect to the onsite electron interaction. It is shown that, for the negative spin-orbit coupling coefficient, the AIAO spin-cluster susceptibility diverges at q=0, while other types of spin-cluster susceptibilities are not developed and are structureless. By calculating the superconducting transition mediated by AIAO spin fluctuation, it is found that a spin-triplet superconductivity appears, while there is no signal of superconducting transition for the spin-singlet one. We suggest that the spin-triplet superconductivity appears around the AIAO spin ordered phase in the pyrochlore lattice.