Observable NMR signal from circulating current order in YBCO

TL;DR

This paper predicts detectable equilibrium magnetic fields in YBCO due to circulating current order in the pseudogap phase, based on neutron scattering evidence, suggesting NMR can observe this broken symmetry state.

Contribution

It demonstrates that circulating current order in YBCO should produce measurable magnetic fields detectable by NMR, linking neutron scattering findings to NMR observables.

Findings

Predicted magnetic fields at atomic sites in YBCO due to current order

NMR experiments can potentially detect the pseudogap phase symmetry breaking

Supports the circulating current model for pseudogap phenomena

Abstract

Assuming, as suggested by recent neutron scattering experiments, that a broken symmetry state with orbital current order occurs in the pseudo-gap phase of the cuprate superconductors, we show that there must be associated equilibrium magnetic fields at various atomic sites in the unit cell, which should be detectable by NMR experiments.