Spin-density wave Fermi surface reconstruction in underdoped YBa2Cu3O6+x

TL;DR

This paper models the Fermi surface reconstruction in underdoped YBa2Cu3O6+x due to a collinear spin-density wave, predicting quantum oscillation frequencies and effective mass enhancements, and suggests experimental tests for the model.

Contribution

It introduces a specific spin-density wave model to explain Fermi surface features and quantum oscillations in underdoped YBa2Cu3O6+x, providing testable predictions.

Findings

Fermi surface consistent with observed quantum oscillation frequencies

Effective quasiparticle mass enhancement by a factor of ~7

Predicted Fermi surface topology for experimental verification

Abstract

We consider the reconstruction expected for the Fermi surface of underdoped YBa2Cu3O6+x in the case of a collinear spin-density wave with a characteristic vector Q=(pi[1+/-2 delta],pi), assuming an incommensurability delta~0.06 similar to that found in recent neutron scattering experiments. A Fermi surface possibly consistent with the multiple observed quantum oscillation frequencies is obtained. From the low band masses expected using this model as compared with experiment, a uniform enhancement of the quasiparticle effective mass over the Fermi surface by a factor of ~7 is indicated. Further predictions of the Fermi surface topology are made, which may potentially be tested by experiment to indicate the relevance of this model to underdoped YBa2Cu3O6+x.