Distinct pressure evolution of superconductivity and charge density wave in kagome superconductor CsV3Sb5 thin flakes

Abstract

It is intriguing to explore the coexistence and (or) competition between charge density wave (CDW) and superconductivity (SC) in many correlated electron systems, such as cuprates [M. Hücker et al., Phys. Rev. B 83, 104506 (2011); Q. Li et al., Phys. Rev. Lett. 99, 067001 (2007), and J. Fink et al., Phys. Rev. B 79, 100502(R) (2009)], organic superconductors [Y. Ihara et al., Phys. Rev. B 100, 060505(R) (2019) and N. Morinaka et al., Phys. Rev. B 80, 092508 (2009)], and dichacolgenides [X. Xi et al., Nat. Nanotechnol. 10, 765 (2015) and J. A. Galvis et al., Phys. Rev. B 87, 094502 (2013)]. Among them, the recently discovered Z2 topological kagome metals AV3Sb5 (A=K, Rb, Cs) serve as an ideal platform to study the intricate relation between them. Here, we report the electrical resistance measurements on CsV3Sb5 thin flakes (≈60 nm) under hydrostatic pressure up to 2.12 GPa to compare its pressure phase diagram of CDW and SC with its bulk form. Even though the CDW transition temperature (TCDW) in CsV3Sb5 thin flakes is still monotonically suppressed under pressure and totally vanishes at P2=1.83 GPa similar to the bulk, the superconducting transition temperature (Tc) shows an initial decrease and consequent increase up to its maximum ∼8.03 K at P2, in sharp contrast with the M-shaped double domes in the bulk CsV3Sb5. Our results suggest the important role of reduced dimensionality on the CDW state and its interplay with the SC, offering a new perspective to explore the exotic nature of CsV3Sb5.

Source-reported materials — not catalogue approval

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