Linear nonsaturating magnetoresistance in kagome superconductor CsV₃Sb₅ thin flakes

Abstract Linear nonsaturating magnetoresistance (LMR) represents a class of anomalous resistivity response to external magnetic field that has been observed in variety materials including but not limited topological semi-metals, high- T c superconductors and with charge density wave (CDW)/spin orders. Here we report the observation LMR layered kagome superconductor CDW material CsV 3 Sb 5 thin flakes, as well dimensional crossover temperature ( ) such LMR. Specifically, ultrathin crystals, (MR) exhibits from at low quadratic B dependence above transition temperature; MR also sublinear for sample thickness around ?20 nm . We discuss several possible origins attribute effect two-dimensional fluctuations. Our results may provide new perspective understanding interactions between competing orders superconductors.