  The quasi-one-dimensional (quasi-1D) TaSe3 attracts considerable attention
for its intriguing superconductivity and possible interplay with nontrivial
topology and charge density wave (CDW) state. However, unlike the isostructural
analogues, 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 ~300 nm thick, a
distinct CDW transition occurs at 65 K in the resistivity measurement, which
has not been reported before and is further evidenced by the Raman
characterization and 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
Hall effect varies from n-type to p-type below 50 K, suggesting a
reconstruction of 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.
