Magnetic field reveals vanishing Hall response in the normal state of stripe-ordered cuprates

TL;DR

This study reveals that in stripe-ordered cuprates, the Hall coefficient vanishes in the high-field normal state, indicating a fundamental property linked to intertwined orders and differing from other cuprates.

Contribution

It demonstrates the vanishing of the Hall coefficient in the high-field normal state of stripe-ordered cuprates, a novel observation in this regime.

Findings

Hall coefficient vanishes for T<(2-6)T_c^0 in stripe-ordered cuprates

High-field behavior differs from other cuprates like YBCO

Suggests an approximate particle-hole symmetry in stripe-ordered cuprates

Abstract

The origin of the weak insulating behavior of the resistivity, i.e. $\rho_{xx}\propto\ln(1/T)$, revealed when magnetic fields ($H$) suppress superconductivity in underdoped cuprates has been a longtime mystery. Surprisingly, the high-field behavior of the resistivity observed recently in charge- and spin-stripe-ordered La-214 cuprates suggests a metallic, as opposed to insulating, high-field normal state. Here we report the vanishing of the Hall coefficient in this field-revealed normal state for all $T<(2-6)T_{\mathrm{c}}^{0}$, where $T_{\mathrm{c}}^{0}$ is the zero-field superconducting transition temperature. Our measurements demonstrate that this is a robust fundamental property of the normal state of cuprates with intertwined orders, exhibited in the previously unexplored regime of $T$ and $H$. The behavior of the high-field Hall coefficient is fundamentally different from that in other cuprates such as YBa$_2$Cu$_3$O$_{6+x}$ and YBa$_2$Cu$_4$O$_{8}$, and may imply an approximate particle-hole symmetry that is unique to stripe-ordered cuprates. Our results highlight the important role of the competing orders in determining the normal state of cuprates.