Observation of charge density wave transition in TaSe3 mesowires

Quasi-one-dimensional (quasi-1D) TaSe3 is attracting considerable attention due to its intriguing superconductivity and possible interplay with nontrivial topology and the charge density wave (CDW) state. However, unlike the isostructural analogs, CDW has not been observed for TaSe3 despite its quasi-1D character that is supposed to promote Peierls instabilities and CDW. Here, we synthesize TaSe3 mesowires (MWs) using a one-step approach. For the MW of similar to 300nm thickness, a distinct CDW transition occurs at 65K in the resistivity measurement, which is further evidenced by the Raman characterization and the susceptibility measurement. For comparison, we have also prepared bulk single crystal TaSe3. Although no anomaly appears in the resistivity and magnetoresistance measurements, the carrier type detected by the Hall effect varies from n-type to p-type below 50K, suggesting a reconstruction of the Fermi surface that could be associated with CDW. The enhancement of CDW in the MWs is attributed to the reduced dimensionality. TaSe3 is demonstrated to be a promising platform to study the correlation and competition of CDW and superconductivity in the quasi-1D systems.