Charge-Stripe Order and Superconductivity in $\mathrm{Ir_{1-x}Pt_xTe_2}$

TL;DR

This study investigates how charge order and superconductivity in $ ext{Ir}_{1-x} ext{Pt}_x ext{Te}_2$ are influenced by Pt substitution and pressure, revealing a structural transition that triggers charge ordering and its competition with superconductivity.

Contribution

It provides the first detailed phase diagram linking charge order and superconductivity in $ ext{Ir}_{1-x} ext{Pt}_x ext{Te}_2$, highlighting the structural transition's role in charge ordering.

Findings

Charge order is triggered by a structural transition.

Charge order appears uniaxially along the (1,0,1) axis.

A phase diagram of charge order and superconductivity is established.

Abstract

A combined resistivity and hard x-ray diffraction study of superconductivity and charge ordering in $\mathrm{Ir_{1-x}Pt_xTe_2}$, as a function of Pt substitution and externally applied hydrostatic pressure, is presented. Experiments are focused on samples near the critical composition $x_c\sim 0.045$ where competition and switching between charge order and superconductivity is established. We show that charge order as a function of pressure in $\mathrm{Ir_{0.95}Pt_{0.05}Te_{2}}$ is preempted - and hence triggered - by a structural transition. Charge ordering appears uniaxially along the short crystallographic (1,0,1) domain axis with a $\mathrm{(\frac{1}{5},0,\frac{1}{5})}$ modulation. Based on these results we draw a charge-order phase diagram and discuss the relation between stripe ordering and superconductivity.