  Layered three-dimensional (3D) topological semimetals have attracted
intensively attention due to the exotic phenomena and abundantly tunable
properties. Here we report the experimental evidence for the 3D topological
semimetal phase in layered material TaNiTe5 single crystals through quantum
oscillations. Strong quantum oscillations have been observed with diamagnetism
background in TaNiTe5. By analyzing the de Haas-van Alphen oscillations,
multi-periodic oscillations were extracted, in content with magnetotransport
measurements. Moreover, nontrivial "{\pi}" Berry phase with 3D Fermi surface is
identified, indicating the topologically nontrivial feature in TaNiTe5.
Additionally, we demonstrated the thin-layer of TaNiTe5 crystals is highly
feasible by the mechanical exfoliation, which offers a platform to explore
exotic properties in low dimensional topological semimetal and paves the way
for potential applications in nanodevices.
