Interplay between sheet resistance increase and magnetotransport properties in ${\rm LaAlO_3}/{\rm SrTiO_3}$

TL;DR

This study investigates how low-temperature conditions, electrical currents, and magnetic fields affect the sheet resistance and magnetotransport properties of LaAlO3/SrTiO3, revealing reversible resistance changes linked to magnetic phenomena.

Contribution

It uncovers the relationship between resistance increase and magnetotransport suppression in LaAlO3/SrTiO3, highlighting temperature-dependent recovery and magnetic effects.

Findings

Sheet resistance increases at low temperatures with currents and magnetic fields.

Resistance recovers near 70 K and 160 K upon warming.

Magnetotransport properties linked to magnetism are suppressed with increased resistance.

Abstract

We find that the sheet resistance ($R_s$) of patterned samples of ${\rm LaAlO_3}/{\rm SrTiO_3}$ with a length scale of several microns may increase significantly at low temperatures in connection with driving electrical currents and applying in-plane magnetic fields. As the samples are warmed up, $R_s$ recovers to its original value with accelerated recovery near ${\rm 70 \ K}$ and ${\rm 160 \ K}$. Concomitantly with the increase in $R_s$, the carrier density and the mobility decrease and magnetotransport properties which may be linked to magnetism are suppressed.