Superconducting dome associated with the suppression and re-emergence of charge density wave states upon sulfur substitution in CuIr2Te4chalcogenides

Mebrouka Boubeche; Ningning Wang; Jianping Sun; Pengtao Yang; Lingyong Zeng; Shaojuan Luo; Yiyi He; Jia Yu; Meng Wang; Jinguang Cheng; Huixia Luo

doi:10.1088/1361-648X/ac594c

Superconducting dome associated with the suppression and re-emergence of charge density wave states upon sulfur substitution in CuIr₂Te₄chalcogenides

J Phys Condens Matter. 2022 Mar 24;34(20). doi: 10.1088/1361-648X/ac594c.

Authors

Affiliations

¹ School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Key Lab of Polymer Composite and Functional Materials, Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, Sun Yat-Sen University, No. 135, Xingang Xi Road, Guangzhou 510275, People's Republic of China.
² Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences and School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
³ School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, People's Republic of China.
⁴ Center for Neutron Science and Technology, School of Physics, Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.

PMID: 35226884
DOI: 10.1088/1361-648X/ac594c

Abstract

We report the path from the charge density wave (CDW)-bearing superconductor CuIr₂Te₄to the metal insulator transition (MIT)-bearing compound CuIr₂S₄by chemical alloying with the gradual substitution of S for Te. The evolution of structural and physical properties of the CuIr₂Te_4-xS_x(0 ⩽x⩽ 4) polycrystalline system is systemically examined. The x-ray diffraction (XRD) results imply CuIr₂Te_4-xS_x(0 ⩽x⩽ 0.5) crystallizes in a NiAs defected trigonal structure, whereas it adapts to the cubic spinel structure for 3.6 ⩽x⩽ 4 and it is a mixed phase in the doping range of 0.5 <x< 3.6. Unexpectedly, the resistivity and magnetization measurements reveal that small-concentration S substitution for Te can suppress the CDW transition, but it reappears aroundx= 0.2, and the CDW transition temperature enhances clearly asxaugments for 0.2 ⩽x⩽ 0.5. Besides, the superconducting critical temperature (T_c) first increases with S doping content and then decreases after reaching a maximumT_c= 2.82 K for CuIr₂Te_3.85S_0.15. MIT order has been observed in the spinel region (3.6 ⩽x⩽ 4) associated withT_MIincreasing withxincreasing. Finally, the rich electronic phase diagram of temperature versusxfor this CuIr₂Te_4-xS_xsystem is assembled, where the superconducting dome is associated with the suppression and re-emergence of CDW as well as MIT states at the end upon sulfur substitution in the CuIr₂Te_4-xS_xchalcogenides.

Keywords: charge density wave; chemical doping; metal insulator transition; superconductivity; ternary copper chalcogenides.