Competing superconductivity and charge-density wave in Kagome metal CsV3Sb5: evidence from their evolutions with sample thickness

Abstract

Recently superconductivity and topological charge-density wave (CDW) were discovered in the Kagome metals $A$V${}_3$Sb${}_5$ ($A$ = Cs, Rb, and K), which have an ideal Kagome lattice of vanadium. Here we report resistance measurements on thin flakes of CsV${}_3$Sb${}_5$ to investigate the evolution of superconductivity and CDW with sample thickness. The CDW transition temperature $T_{\mathrm{CDW}}$ decreases from 94 K in bulk to a minimum of 82 K at thickness of 60 nm, then increases to 120 K as the thickness is reduced further to 4.8 nm (about five monolayers). Since the CDW order in CsV${}_3$Sb${}_5$ is quite three-dimensional (3D) in the bulk sample, the non-monotonic evolution of $T_{\mathrm{CDW}}$ with reducing sample thickness can be explained by a 3D to 2D crossover around 60 nm. Strikingly, the superconducting transition temperature $T_{\mathrm{c}}$ shows an exactly opposite evolution, increasing from 3.64 K in the bulk to a maximum of 4.28 K at thickness of 60 nm, then decreasing to 0.76 K at 4.8 nm. Such exactly opposite evolutions provide strong evidence for competing superconductivity and CDW, which helps us to understand these exotic phases in $A$V${}_3$Sb${}_5$ Kagome metals.

4 pages, 4 figures

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• AV${}_3$Sb${}_5$ Kagome Superconductors: Progress and Future Directions
• Superconducting diode effect and interference patterns in Kagome CsV3Sb5
• A unique van Hove singularity in kagome superconductor CsV${}_{3-x}$Ta${}_x$Sb${}_5$ with enhanced superconductivity
• $\pi$ Phase Interlayer Shift and Stacking Fault in the Kagome Superconductor CsV${}_3$Sb${}_5$
• FeGe as a building block for the kagome 1:1, 1:6:6, and 1:3:5 families: hidden d-orbital decoupling of flat band sectors, effective models and interaction Hamiltonians
• Kagome metals
• Phenomenology of bond and flux orders in kagome metals
• Roadmap on Quantum Magnetic Materials
• Kagome Materials I: SG 191, ScV${}_6$Sn${}_6$. Flat Phonon Soft Modes and Unconventional CDW Formation: Microscopic and Effective Theory
• Frustrated charge density wave and quasi-long-range bond-orientational order in the magnetic kagome FeGe
• Emergence of Quantum Confinement in Topological Kagome Superconductor CsV${}_3$Sb${}_5$ family
• Two-dimensional phase diagram of the charge density wave in doped CsV${}_3$Sb${}_5$
• Kagome materials $A$V${}_3$Sb${}_5$ ($A$=K,Rb,Cs): pairing symmetry and pressure-tuning studies
• Magnetism in AV3Sb5 (Cs, Rb, K): Origin and Consequences for the Strongly Correlated Phases
• Flat bands and distinct density wave orders in correlated Kagome superconductor CsCr${}_3$Sb${}_5$
• Topological Superconducting States and Quasiparticle Transport on Kagome Lattice
• Quantum Phase Transition as a Promising Route to Enhance the Critical Current in Kagome Superconductor CsV${}_3$Sb${}_5$
• Distinct pressure evolution of superconductivity and charge-density-wave in kagome superconductor CsV${}_3$Sb${}_5$ thin flakes
• Charge-density wave fluctuation driven composite order in the layered Kagome Metals
• Two-dimensional superconductivity in a thick exfoliated kagome film
• Beyond kagome: $p$-bands in kagome metals
• Current-induced magnetoresistance hysteresis in the kagome superconductor CsV${}_3$Sb${}_5$
• Tunable Competing Electronic Orders in Double Quantum Spin Hall Superlattices
• A Convenient Sealing Method Using Boron Nitride Capping for Reactive Reactions