Superfluid density as a guide to optimal superconductivity in doped low dimensional antiferromagnets

TL;DR

This paper investigates how superfluid density can indicate the optimal superconducting state in doped low-dimensional antiferromagnets, revealing a quantum critical point linked to a glassy state.

Contribution

It identifies a phase transition associated with optimal superconductivity and suggests a universal mechanism independent of material disorder.

Findings

Superfluid density correlates with optimal superconductivity.

A quantum critical point is observed near the glassy state emergence.

Superconductivity's intrinsic nature is confirmed across different materials.

Abstract

Following the direct observation of abrupt changes in the superconducting ground state in doped low dimensional antiferromagnets, we have identified a phase transition where superconductivity is optimal. The experiments indicate the presence of a putative quantum critical point associated with the emergence of a glassy state. This mechanism is argued to be an intrinsic property and as such largely independent of material quality and the level of disorder.