Interplay between Charge-Density-Wave, Superconductivity, and Ferromagnetism in CuIr<sub>2–<i>x</i></sub>Cr<sub><i>x</i></sub>Te<sub>4</sub> Chalcogenides
Lingyong Zeng, Xunwu Hu, Ningning Wang, Jianping Sun, Pengtao Yang, Mebrouka Boubeche, Shaojuan Luo, Yiyi He, Jinguang Cheng, Dao‐Xin Yao, Huixia Luo
Abstract
We report the crystal structure, charge-density-wave (CDW), superconductivity (SC), and ferromagnetism (FM) in CuIr2–xCrxTe4 (0 ≤ x ≤ 2) chalcogenides. Powder x-ray diffraction (PXRD) results reveal that the CuIr2–xCrxTe4 series are distinguished between two structural types and three different regions: (i) layered trigonal structure region, (ii) mixed phase regions, and (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 of 1.9 ≤ x ≤ 2. This finding provides a comprehensive material platform for investigating the interplay between CDW, SC, and FM multipartite quantum states.