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Linear nonsaturating magnetoresistance in kagome superconductor CsV3Sb5 thin flakes

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arxiv 2210.16890 v1 pith:RYCCOGFZ submitted 2022-10-30 cond-mat.supr-con cond-mat.mes-hall

Linear nonsaturating magnetoresistance in kagome superconductor CsV3Sb5 thin flakes

Xinjian Wei , Congkuan Tian , Hang Cui , Yongkai Li , Shaobo Liu , Ya Feng , Jian Cui , Yuanjun Song
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Zhiwei Wang Jian-Hao Chen
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classification cond-mat.supr-con cond-mat.mes-hall
keywords crossovercsv3sb5kagomemagnetoresistanceexhibitsflakeslinearmaterials
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Linear nonsaturating magnetoresistance (LMR) represents a class of anomalous resistivity response to external magnetic field that has been observed in a variety 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 superconductor and CDW material CsV3Sb5 thin flakes, as well as the dimensional crossover and temperature (T) crossover of such LMR. Specifically, in ultrathin CsV3Sb5 crystals, the magnetoresistance (MR) exhibits a crossover from LMR at low T to quadratic B dependence above the CDW transition temperature; the MR also exhibits 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 attribute the effect to two-dimensional (2D) CDW fluctuations. Our results may provide a new perspective for understanding the interactions between competing orders in kagome superconductors.

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