Effect of the pseudogap on the Hall conductivity in underdoped YBa_2Cu_3O_6+x

TL;DR

This paper investigates how the pseudogap phase in underdoped YBa_2Cu_3O_6+x affects the Hall conductivity, revealing a significant suppression of Hall response below the pseudogap temperature and into the vortex state.

Contribution

It provides new insights into the impact of the pseudogap on Hall conductivity and vortex dynamics in underdoped cuprate superconductors.

Findings

Hall response is significantly reduced below T^*

Hall conductivity suppression persists into the vortex state

Diagonal current remains relatively unaffected

Abstract

In underdoped YBa_2Cu_3O_x (YBCO) with x = 6.63, the opening of the pseudogap at T^* ~ 160 K has a strong effect on the Hall angle tan(theta). While the Hall response is significantly reduced, the diagonal current is relatively unaffected. The Hall conductivity suppression continues deep into the flux-flow state (from T_c to 40 K), as an anomalous suppression of the vortex Hall current.