Phase Diagram of Pressure-induced Superconductivity and its Relation to Hall Coefficient in Bi2Te3 Single Crystal

TL;DR

This study maps the phase diagram of pressure-induced superconductivity in Bi2Te3, revealing complex behaviors and their relation to Hall coefficient changes, providing insights into the material's electronic properties under pressure.

Contribution

It presents a comprehensive phase diagram of Bi2Te3 under pressure and links superconductivity with Hall coefficient variations, highlighting new pressure-dependent electronic phenomena.

Findings

Superconductivity appears over a wide pressure range.

Hall coefficient exhibits dramatic changes before structural transitions.

A pressure-induced crossover in Hall coefficient is observed.

Abstract

Pressure-induced superconductivity and its relation to corresponding Hall coefficient (RH) have been reported for Bi2Te3, one of known topological insulators. A full phase diagram is presented which shows a complex dependence of the superconducting transition temperature as a function of pressure over an extensive range. High-pressure RH measurements reveal a close relation of these complex behaviors, particularly, a dramatic change of dRH/dP before structural phase transition and a pressure-induced crossover on RH in the high pressure phase were observed.