Enhancement of superconductivity and suppression of charge-density wave in As-doped CsV3Sb5

Abstract

We have investigated the As-doping effect in the newly discovered kagome superconductor CsV3Sb5 via measurements of x-ray diffraction, electrical resistivity, magnetic susceptibility, and specific heat. Our results show that partial substitution of Sb with As leads to shrinkage of the c lattice, which effectively applies a chemical pressure in the system. The solubility of As atoms is about 2.3% for single crystals grown by the self-flux method. In the As-doped single crystal CsV3(Sb0.977As0.023)5, the charge-density-wave (CDW) transition temperature TCDW is suppressed from 94 to 83 K, and the superconducting transition temperature Tc is enhanced from 2.5 to 3.6 K. Furthermore, the residual resistivity ratio is significantly reduced, and the magnetoresistance with magnetic field along the c axis decreases by nearly one order of magnitude, indicating substantial disorder scattering induced by the As doping. The anomalous Hall effect (AHE) is only observed below TCDW, indicating the intimate relationship between CDW and AHE. We found that the As-doping effect on Tc and TCDW is basically equivalent to the hydrostatic pressure effect at 0.2 GPa.

Source-reported materials — not catalogue approval

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