Interplay between Charge-Density-Wave, Superconductivity, and Ferromagnetism in CuIr2-xCrxTe4 Chalcogenides

TL;DR

This study explores how Cr doping in CuIr2-xCrxTe4 affects its structure and physical properties, revealing the coexistence and competition of charge-density-wave, superconductivity, and ferromagnetism.

Contribution

It provides a comprehensive analysis of structural and physical property changes due to Cr substitution, highlighting the interplay between multiple quantum states in this material.

Findings

Cr doping induces collapse of CDW and formation of dome-shaped superconductivity.

Superconducting critical temperature peaks at 2.9 K around x=0.06.

Ferromagnetic Curie temperature increases with Cr content from 175 K to 260 K.

Abstract

We report the crystal structure, charge-density-wave (CDW), superconductivity (SC), and ferromagnetism (FM) in CuIr2-xCrxTe4 chalcogenides. Powder x-ray diffraction (PXRD) results reveal that CuIr2-xCrxTe4 series are distinguished between two structural types and three different regions: (i) layered trigonal structure region, (ii) mixed phase regions, (iii) spinel structure region. Besides, Cr substitution for Ir site results in rich physical properties including the collapse of CDW, the formation of dome-shaped like SC, and the emergence of magnetism. Cr doping slightly elevates the superconducting critical temperature (Tsc) to its highest Tsc = 2.9 K around x = 0.06. As x increases from 0.3 to 0.4, the ferromagnetic Curie temperature (Tc) increases from 175 to 260 K. However, the Tc remains unchanged in the spinel range from 1.9 to 2. This finding provides a comprehensive material platform for investigating the interplay between CDW, SC, and FM multipartite quantum states.