Competitive superconductivity and charge density wave in Mo-doped kagome superconductor CsV3Sb5

Abstract

In the kagome superconductors AV3Sb5 (A = K, Rb, Cs), understanding the charge-density-wave (CDW) state and its entanglement with the superconducting ground state is still a challenging issue. Here, by measuring the electrical transport, magnetic susceptibility, Hall effect, and V51 nuclear magnetic resonance (NMR), the evolution of superconductivity (SC) and the CDW is comprehensively studied in Cs(V1−xMox)3Sb5. In contrast with previously reported results for other doped cases, the CDW transition temperature slightly increases to ∼100 K with increasing Mo doping. Meanwhile, the SC is quickly suppressed and vanishes above x=0.02. The anomalous Hall effect (AHE), which is tied to the exotic nature of the CDW state in pristine CsV3Sb5, is also strongly suppressed and completely disappears above x=0.07. Further V51 NMR investigation on the CDW state in Cs(V0.95Mo0.05)3Sb5 indicates that a short-range stripelike CDW evolves from the original triple-Q CDW state with increasing Mo doping, which largely reduces the density of states at the Fermi level. This result provides a self-consistent explanation for the disappearance of both SC and the AHE by increasing Mo doping, which offers insights into the competitive behavior between SC and the CDW state in the kagome superconductors AV3Sb5. Published by the American Physical Society 2024