Hall coefficient of La$_{1.88-y}$Y$_y$Sr$_{0.12}$CuO$_4$ ($y=0, 0.04$) at low temperatures under high magnetic fields

TL;DR

This study measures the Hall coefficient in La-based cuprate crystals under high magnetic fields to understand transport properties in the stripe phase at low temperatures, revealing a finite negative Hall coefficient when superconductivity is suppressed.

Contribution

It provides detailed measurements of the Hall coefficient in stripe phase La$_{1.88-y}$Y$_y$Sr$_{0.12}$CuO$_4$ under high magnetic fields, highlighting the negative value in the low-temperature regime.

Findings

Hall coefficient becomes negative at low temperatures under high magnetic fields.

Negative Hall coefficient region expands with increasing magnetic field.

Hall coefficient in stripe phase is finite and negative, not zero.

Abstract

The Hall coefficient in the low-temperature tetragonal phase and the mid-temperature orthorhombic phase of La$_{1.88-y}$Y$_y$Sr$_{0.12}$CuO$_4$ ($y=0, 0.04$) single crystals is measured under high magnetic fields up to 9 T in order to investigate the detailed behavior of the transport properties at low temperatures in the stripe phase. When the superconductivity is suppressed by high magnetic fields, the Hall coefficient has negative values in low temperatures, and the temperature region of the negative values spreads as increasing magnetic fields. This result indicates that the Hall coefficient in the stripe phase around $x=0.12$ is a finite negative value, not zero.