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Linear nonsaturating magnetoresistance (LMR) represents a class of anomalousresistivity response to external magnetic field that has been observed in avariety of materials including but not limited to topological semi-metals,high-Tc superconductors and materials with charge/spin density wave (CDW/SDW)orders. Here we report the observation of LMR in layered kagome superconductorand CDW material CsV3Sb5 thin flakes, as well as the dimensional crossover andtemperature (T) crossover of such LMR. Specifically, in ultrathin CsV3Sb5crystals, the magnetoresistance (MR) exhibits a crossover from LMR at low T toquadratic B dependence above the CDW transition temperature; the MR alsoexhibits a crossover from LMR to sublinear MR for sample thickness at around~20 nm at low T. We discuss several possible origins of the LMR and attributethe effect to two-dimensional (2D) CDW fluctuations. Our results may provide anew perspective for understanding the interactions between competing orders inkagome superconductors.

Linear nonsaturating magnetoresistance in kagome superconductor CsV3Sb5 thin flakes