Effect of Cu doping on superconductivity in TaSe${}_3$: Relationship between superconductivity and induced charge density wave

Abstract

By measuring the temperature dependence of the resistance, we investigated the effect of Cu doping on superconductivity (SC) in Cu-doped TaSe${}_3$ in which the charge density wave (CDW) transition is induced by Cu doping. We observed an emergence of a region where the SC transition temperature ($T_{\mathrm{C}}$) decreased in samples with higher Cu concentrations and found that the region tended to expand with increasing Cu concentration. In addition, the temperature dependence of the upper critical field ($H_{C2}$) of Cu-doped TaSe${}_3$ was found to differ from that of pure TaSe${}_3$. Based on these experimental results and the fact that the SC of TaSe${}_3$ is filamentary, we conclude that SC is suppressed locally by Cu doping and competes with the CDW in Cu-doped TaSe${}_3$. The resistance anomaly due to the CDW transition was extremely small and the size of the anomaly was enhanced with increasing Cu concentration but the temperature at which the anomaly appeared hardly changed. This result of the anomaly and the local suppression of SC imply that the induced CDWs are short-range order in the vicinity of Cu atoms. We also discuss the effect of the pinning of CDWs on the relationship between SC and short-range order CDWs.

arXiv comment7 pages, 6 figures, 1 table

References in corpus (5)

• Superconductivity in Cu_xTiSe_2
• Observation of a Charge Density Wave Incommensuration Near the Superconducting Dome in CuxTiSe2
• Stripe and short range order in the charge density wave of 1T-Cu${}_x$TiSe${}_2$
• Multi-band superconductivity and nanoscale inhomogeneity at oxide interfaces
• Evidence of weak superconductivity at the room-temperature grown LaAlO${}_3$/SrTiO${}_3$ interface

Cited by in corpus (4)

• One-Dimensional van der Waals Quantum Materials -- State of the Art and Perspectives
• Electrically-Insulating Flexible Films with Quasi-One-Dimensional van-der-Waals Fillers as Efficient Electromagnetic Shields
• Observation of charge density wave transition in TaSe3 mesowires
• Multiple mobile excitons manifested as sidebands in quasi-one-dimensional metallic TaSe3