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We report the synthesis and systematic studies of a new layered ternarytelluride TaPdTe5 with quasi-one-dimensional PdTe2 chains. This compoundcrystalizes in a layered orthorhombic structure with space group Cmcm. Analysisof its curved field-dependent Hall resistivity, using the two-band model,indicates the hole-dominated transport with a high mobility ${\mu}_h$ = 2.38$\times$ 10$^3$ cm$^2$ V$^{-1}$ s$^{-1}$ at low temperatures. The in-planemagnetoresistance (MR) displays significant anisotropy with field applied alongthe crystallographic $b$ axis. The MR with the current applied along the$c$-axis is also measured in high magnetic fields up to 51.7 T. Remarkably, itfollows a power-law dependence and reaches (9.5 $\times$ 10$^3$)% at 2.1 Kwithout any signature of saturation. The De Haas-van Alphen oscillations show asmall Fermi-surface pocket with a nontrivial Berry phase. The Shubnikov-de Haas(SdH) oscillations are detected at low temperatures and under magnetic fieldsabove 28.5 T. Two effective masses $m^*$ (0.26$m_e$ and 0.41$m_e$) areextracted from the oscillatory SdH data. Our first-principles calculationsunveil a topological Dirac cone in its surface states, and, in particular, thetopological index indicates that TaPdTe$_5$ is a topologically nontrivialmaterial.

Topological Dirac states in a layered telluride TaPdTe$_5$ with quasi-one-dimensional PdTe$_2$ chains