Charge- versus spin driven stripe order: the role of transversal spin fluctuations

TL;DR

This paper investigates how transverse spin fluctuations influence stripe order in cuprate superconductors, revealing that spin dynamics significantly affect charge and spin ordering temperatures and challenging the notion that stripe order is purely charge-driven.

Contribution

It demonstrates that spatial anisotropy impacts transverse spin fluctuations more at finite temperatures, highlighting the role of spin fluctuations in stripe order formation.

Findings

Transverse spin fluctuations are more affected by spatial anisotropy at finite temperatures.

Spin fluctuations prevent spin system condensation at the charge ordering temperature.

Charge-spin coupling alone does not determine stripe order onset.

Abstract

The separation of the charge- and spin ordering temperatures of the stripe phase in cuprate superconductors has been used to argue that the striped phase is charge driven. Scaling analysis of a non-linear sigma model shows that the effect of spatial anisotropy on the transversal spin fluctuations is much more drastic at finite temperatures than at zero temperature. These results suggest that the spin fluctuations prohibit the spin system to condense at the charge ordering temperature, despite a possible dominance of charge-spin coupling in the longitudinal channel.