Theory of `hidden' quasi-1D superconductivity in Sr$_2$RuO$_4$

TL;DR

This paper proposes a new theoretical framework suggesting that superconductivity in Sr$_2$RuO$_4$ is more akin to quasi-one-dimensional organic superconductors, challenging previous assumptions and aligning with experimental observations.

Contribution

It introduces a perturbative renormalization group approach indicating Sr$_2$RuO$_4$'s superconductivity resembles quasi-1D organic superconductors, a novel perspective in the field.

Findings

Superconductivity in Sr$_2$RuO$_4$ is closer to quasi-1D organic superconductors.

The theory aligns with key experimental phenomena.

Challenges previous assumptions about Sr$_2$RuO$_4$'s mechanism.

Abstract

Is the mechanism of unconventional superconductivity in Sr$_2$RuO$_4$ closer in spirit to superfluid $^3$He, or to the cuprates, pnictides, and organic superconductors? We challenge prevailing assumptions in this field and using well-controlled perturbative renormalization group calculations, we suggest that superconductivity in Sr$_2$RuO$_4$ resembles more closely the quasi-one dimensional organic superconductors. Our theory has certain phenomenological consequences that are consistent with the experimentally observed phenomena.