Enhanced superconductivity with possible re-appearance of charge density wave states in polycrystalline CuAgIrTe 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 IrTe superconductors. Based on the resistivity, magnetization, and heat capacity, we explored the changes in the superconductivity and charge density wave for CuAgIrTe 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 and upper H critical magnetic fields were determined for some representative samples in the CuAgIrTe series based on magnetization and resistivity measurements, respectively. We showed that H decreased whereas H increased as the doping content increased. The specific heat anomalies at the superconducting transitions for representative samples comprising CuAgIrTe, CuAgIrTe, and CuAgIrTe 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.
35 pages, 6 figures, 3 tables;The manuscript with the same title will be published by Journal of Physics and Chemistry of Solids