Anomalous Charge Density Wave State Evolution and Dome-like Superconductivity in CuIr2Te4-xSex Chalcogenides

Abstract

We report the anomalous charge density wave (CDW) state evolution and dome-like superconductivity (SC) in CuIr2Te4-xSex series. Room temperature powder X ray-diffraction (PXRD) results indicate that CuIr2Te4-xSex compounds retain the same structure as the host CuIr2Te4 and the unit cell constants a and c manifest a linear decline with increasing Se content. Magnetization, resistivity and heat capacity results suggest that superconducting transition temperature (Tc) exhibits a weak dome-like variation as substituting Te by Se with the maximum Tc = 2.83 K for x = 0.1 followed by suppression in Tc and simultaneous decrease of the superconducting volume fraction. Unexpectedly, the CDW-like transition (TCDW) is suppressed with lower Se doping but re-emerges at higher doping. Meanwhile, the temperature-dependent XRD measurements show that the trigonal structure is stable at 20 K, 100 K and 300 K for the host sample and the doping composition with x = 0.5, thus we propose that the behaviour CDW-like transition arises from the disorder effect created by chemical doping and is not related to structural transition. The lower and the upper critical fields of these compounds are also addressed.

The manuscript with the same title will be published by Superconductor Science and Technology, 2021

References in corpus (3)

• Type I superconductivity in the Dirac semimetal PdTe2
• Coexistence of superconductivity and charge-density wave in the quasi-one-dimensional material HfTe3
• Enhanced Superconductivity in the Se-substituted 1T-PdTe${}_2$

Cited by in corpus (4)

• Method to extracting the penetration field in superconductors from DC magnetization data
• Superconducting dome associated with the suppression and re-emergence of charge density wave states upon sulfur substitution in CuIr2Te4 chalcogenides
• Enhanced superconductivity with possible re-appearance of charge density wave states in polycrystalline Cu${}_{1-x}$Ag${}_x$Ir${}_2$Te${}_4$ alloys
• Superconductivity in CuIr2-xAlxTe4 telluride chalcogenides