Anomalous Low-temperature Magnetotransport in Kagome Metal CsCr$_3$Sb$_5$ under Pressure

TL;DR

This study investigates the complex electronic phases of CsCr$_3$Sb$_5$ under pressure, revealing magnetotransport anomalies that suggest an exotic order similar to charge-density waves, expanding understanding of kagome metals.

Contribution

Systematic magnetotransport experiments under pressure uncover signatures of an exotic electronic order in CsCr$_3$Sb$_5$, a kagome superconductor, near a temperature anomaly.

Findings

Observation of non-trivial Hall coefficient behavior below T3

Detection of multi-band characteristics in magnetotransport data

Pressure-enhanced anomalous Hall-like effect

Abstract

As a unique kagome superconductor displaying clear signatures of strong electronic correlations, CsCr$_3$Sb$_5$ has drawn much attention. Its rich temperature-pressure phase diagram features intertwined orders including pressure-induced superconductivity and two density-wave-like phases, making it an outstanding platform to explore the complex coexistence and competition of multiple quantum orders. At around 30 K, which we designate as $T_3$, a possible anomaly manifesting as a hump in the resistivity has been observed, yet its nature remains largely unexplored due to limited supporting evidence from other probes. Here, we conducted systematic magnetotransport experiments under hydrostatic pressure to investigate the nature of this anomaly. Our results reveal an abundance of intriguing magnetotransport signatures below $T_3$, including a non-trivial temperature dependence of the Hall coefficient, multi-band characteristics, and pressure-enhanced anomalous-Hall-like effect. These signatures bear resemblance to those observed in the charge-density-wave state in the sister compound CsV$_3$Sb$_5$. These findings suggest the possibility of an additional, exotic electronic order in CsCr$_3$Sb$_5$, calling for further detailed investigations.