# Pressure-Driven Valence Increase and Metallization in Kondo Insulator Ce$_3$Bi$_4$Pt$_3$

## TL;DR

This study investigates how high pressure affects the structural, electronic, and valence properties of the Kondo insulator Ce$_3$Bi$_4$Pt$_3$, revealing increased electron correlations and suppression of its insulating state, with implications for topological phases.

## Contribution

First high-pressure study on Ce$_3$Bi$_4$Pt$_3$ demonstrating valence increase and metallization, providing insights into pressure effects on Kondo insulators and topological states.

## Key findings

- Ce valence increases with pressure
- Insulating state is suppressed under high pressure
- Material becomes more metallic at high pressure

## Abstract

We report the results of high pressure x-ray diffraction, x-ray absorption, and electrical transport measurements of Kondo insulator Ce$_3$Bi$_4$Pt$_3$ up to 42 GPa, the highest pressure reached in the study of any Ce-based KI. We observe a smooth decrease in volume and movement toward intermediate Ce valence with pressure, both of which point to increased electron correlations. Despite this, temperature-dependent resistance data show the suppression of the interaction-driven ambient pressure insulating ground state. We also discuss potential ramifications of these results for the predicted topological KI state.