Current-induced magnetoresistance hysteresis in the kagome superconductor CsV$_3$Sb$_5$

TL;DR

This study reveals current-induced magnetoresistance hysteresis and a superconducting diode effect in CsV$_3$Sb$_5$, linking these phenomena to its superconducting state and chiral domain-wall scattering, and highlighting its potential for exploring exotic physics.

Contribution

It demonstrates the direct connection between magnetoresistance hysteresis and superconductivity, and uncovers a magnetic-field-driven superconducting diode effect in CsV$_3$Sb$_5$.

Findings

Magnetoresistance hysteresis appears only below the superconducting transition.

Superconducting diode effect is observed with a small magnetic field.

Hysteresis vanishes when superconductivity is suppressed.

Abstract

We report the observation of current-modulated magnetoresistance hysteresis below the superconducting transition temperature in the kagome superconductor CsV$_3$Sb$_5$. This highly tunable hysteresis behavior is confined to the superconducting state and vanishes when superconductivity is fully suppressed, directly linking magnetoresistance hysteresis to the superconducting order in CsV$_3$Sb$_5$. Additionally, the superconducting diode effect driven by a small magnetic field is observed, indicating the enhanced electronic magnetochiral anisotropy by the chiral domain-wall scattering. Our findings position CsV$_3$Sb$_5$ as a promising platform for exploring nontrivial physical phenomena, including unconventional pairing mechanisms and topological superconductivity.