Enhanced superconductivity with possible re-appearance of charge density wave states in polycrystalline Cu$_{1-x}$Ag$_x$Ir$_2$Te$_4$ alloys

Mebrouka Boubeche; Lingyong Zeng; Xunwu Hu; Shu Guo; Yiyi He; Peifeng Yu; Yanhao Huang; Chao Zhang; Shaojuan Luo; Dao-Xin Yao; Huixia Luo

doi:10.1016/j.jpcs.2021.110539

paper

Enhanced superconductivity with possible re-appearance of charge density wave states in polycrystalline Cu $_{1 - x}$ Ag $_{x}$ Ir $_{2}$ Te $_{4}$ alloys

arXiv:2112.04676 · doi:10.1016/j.jpcs.2021.110539

Abstract

In this study, we determined the effect of doping with the noble metal Ag on Ir $_{2}$ Te $_{4}$ superconductors. Based on the resistivity, magnetization, and heat capacity, we explored the changes in the superconductivity and charge density wave for Cu $_{1 - x}$ Ag $_{x}$ Ir $_{2}$ Te $_{4}$ as a function of isoelectric substitution. We assessed a complete set of competing states from suppressed charge density wave in the low doping region to superconductor in the middle doping region and re-entrant charge density wave in the high doping region, thereby obtaining an electronic phase diagram, where the superconducting dome was near bipartite charge density wave regions with a maximum superconducting temperature Tc of about 2.93 K at an Ag doping level of 12%. The lower H $_{c 1}$ and upper H $_{c 2}$ critical magnetic fields were determined for some representative samples in the Cu $_{1 - x}$ Ag $_{x}$ Ir $_{2}$ Te $_{4}$ series based on magnetization and resistivity measurements, respectively. We showed that H $_{c 1}$ decreased whereas H $_{c 2}$ increased as the doping content increased. The specific heat anomalies at the superconducting transitions $Δ C_{e l} / γ T_{c}$ for representative samples comprising Cu $_{0.92}$ Ag $_{0.08}$ Ir $_{2}$ Te $_{4}$ , Cu $_{0.88}$ Ag $_{0.12}$ Ir $_{2}$ Te $_{4}$ , and Cu $_{0.85}$ Ag $_{0.15}$ Ir $_{2}$ Te $_{4}$ were approximately 1.40, 1.44, and 1.42, respectively, which are all near the Bardeen-Cooper-Schrieffer value of 1.43 and they indicate bulk superconductivity in these compounds.

arXiv comment35 pages, 6 figures, 3 tables;The manuscript with the same title will be published by Journal of Physics and Chemistry of Solids

Enhanced superconductivity with possible re-appearance of charge density wave states in polycrystalline Cu $_{1 - x}$ Ag $_{x}$ Ir $_{2}$ Te $_{4}$ alloys

Abstract

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Enhanced superconductivity with possible re-appearance of charge density wave states in polycrystalline Cu1−x​Agx​Ir2​Te4​ alloys

Abstract

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Cited by in corpus (3)

Enhanced superconductivity with possible re-appearance of charge density wave states in polycrystalline Cu $_{1 - x}$ Ag $_{x}$ Ir $_{2}$ Te $_{4}$ alloys