Theory of Low-Temperature Hall Effect in Stripe--Ordered Cuprates

TL;DR

This paper models how static stripe order in cuprates influences the Hall effect, revealing potential sign changes and magnitude variations depending on stripe potential strength, with implications for understanding high-temperature superconductors.

Contribution

It provides a theoretical analysis of the Hall effect in stripe-ordered cuprates, showing how different stripe potentials affect the Hall coefficient's magnitude and sign.

Findings

Increasing spin stripe potential can cause sign changes in R_H.

Charge stripe potential increases R_H without sign change.

Large stripe potentials lead to quasi-one-dimensional behavior with finite R_H.

Abstract

We investigate the effect of static anti-phase stripe order on the weak-field Hall effect of electrons on a two-dimensional square lattice with electron dispersion appropriate to the high T$_c$ cuprates. We first consider the cases where the magnitudes of the spin and charge stripe potentials are smaller than or of the same order as the bandwidth of the two-dimensional electrons, so that the electronic properties are not too strongly one-dimensional. In a model with only spin stripe potential, and at carrier concentrations appropriate to hole-doped cuprates, increasing the stripe scattering potential from zero leads to an increase in $R_H$, followed by a sign change. If the scattering amplitude is yet further increased, a second sign change occurs. The results are in semiquantitative agreement with data. In a charge-stripe-potential-only model, $R_H$ increases as the charge stripe scattering strength increases, with no sign change occurring. In a model with both spin and charge stripe potentials, $R_H$ may be enhanced or may change sign, depending on the strengths of the two scattering potentials. We also consider the case in which the magnitudes of the stripe potentials are much larger than the bandwidth, where analytical results can be obtained. In this limit, the system is quasi-one-dimensional, while $R_H$ remains finite and its sign is determined by the carrier density and the electron band parameters.