Local pairing versus bulk superconductivity intertwined by the charge density wave order in Cs(V1-xTax)3Sb5

Jinyulin Li; Qing Li; Jinjin Liu; Ying Xiang; Huan Yang; Zhiwei Wang; Yugui Yao; Hai Hu Wen

doi:10.1103/PhysRevMaterials.8.014801

Local pairing versus bulk superconductivity intertwined by the charge density wave order in Cs(V1-xTax)3Sb5

Jinyulin Li, Qing Li, Jinjin Liu, Ying Xiang, Huan Yang^*, Zhiwei Wang^*, Yugui Yao, Hai Hu Wen^*

^*Corresponding author for this work

School of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

There is a common belief that superconductivity and charge density wave (CDW) order accommodate homogenously in real space but compete with each other for the effective density of states in momentum space in CDW superconductors. By measuring resistivity along the c axis in Cs(V1-xTax)3Sb5, we observe strong superconducting fluctuation behavior coexisting with the CDW order in pristine CsV3Sb5, and the fluctuation region becomes narrowed when the Ta doping suppresses the CDW order. The onset transition temperature barely changes with the Ta doping. Therefore, the bulk superconductivity may be established by a doping-independent local pairing, and it can be suppressed in some regions by the spatially variable CDW order along the c axis. Our results violate the above-mentioned belief about CDW superconductors and demonstrate the intricate interaction between superconductivity and CDW order in this kagome superconductor.

Original language	English
Article number	014801
Journal	Physical Review Materials
Volume	8
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevMaterials.8.014801
Publication status	Published - Jan 2024

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abstract = "There is a common belief that superconductivity and charge density wave (CDW) order accommodate homogenously in real space but compete with each other for the effective density of states in momentum space in CDW superconductors. By measuring resistivity along the c axis in Cs(V1-xTax)3Sb5, we observe strong superconducting fluctuation behavior coexisting with the CDW order in pristine CsV3Sb5, and the fluctuation region becomes narrowed when the Ta doping suppresses the CDW order. The onset transition temperature barely changes with the Ta doping. Therefore, the bulk superconductivity may be established by a doping-independent local pairing, and it can be suppressed in some regions by the spatially variable CDW order along the c axis. Our results violate the above-mentioned belief about CDW superconductors and demonstrate the intricate interaction between superconductivity and CDW order in this kagome superconductor.",

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AU - Yang, Huan

AU - Wang, Zhiwei

AU - Yao, Yugui

AU - Wen, Hai Hu

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AB - There is a common belief that superconductivity and charge density wave (CDW) order accommodate homogenously in real space but compete with each other for the effective density of states in momentum space in CDW superconductors. By measuring resistivity along the c axis in Cs(V1-xTax)3Sb5, we observe strong superconducting fluctuation behavior coexisting with the CDW order in pristine CsV3Sb5, and the fluctuation region becomes narrowed when the Ta doping suppresses the CDW order. The onset transition temperature barely changes with the Ta doping. Therefore, the bulk superconductivity may be established by a doping-independent local pairing, and it can be suppressed in some regions by the spatially variable CDW order along the c axis. Our results violate the above-mentioned belief about CDW superconductors and demonstrate the intricate interaction between superconductivity and CDW order in this kagome superconductor.

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Local pairing versus bulk superconductivity intertwined by the charge density wave order in Cs(V1-xTax)3Sb5

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