We report the synthesis and systematic studies of a new layered ternary telluride TaPdTe5 with quasi-one-dimensional PdTe2 chains. This compound crystalizes in a layered orthorhombic structure with space group Cmcm. Analysis of its curved field-dependent Hall resistivity, using the two-band model, indicates the hole-dominated transport with a high mobility μh = 2.38 × 103 cm2 V−1 s−1 at low temperatures. The in-plane magnetoresistance (MR) displays significant anisotropy with field applied along the 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, it follows a power-law dependence and reaches (9.5 × 103)% at 2.1 K without any signature of saturation. The De Haas-van Alphen oscillations show a small Fermi-surface pocket with a nontrivial Berry phase. The Shubnikov-de Haas (SdH) oscillations are detected at low temperatures and under magnetic fields above 28.5 T. Two effective masses m∗ (0.26me and 0.41me) are extracted from the oscillatory SdH data. Our first-principles calculations unveil a topological Dirac cone in its surface states, and, in particular, the topological index indicates that TaPdTe5 is a topologically nontrivial material.
@article{arxiv.2006.09070,
title = {Topological Dirac states in a layered telluride TaPdTe$_5$ with quasi-one-dimensional PdTe$_2$ chains},
author = {Wen-He Jiao and Xiao-Meng Xie and Yi Liu and Xiaofeng Xu and Bin Li and Chun-Qiang Xu and Ji-Yong Liu and Wei Zhou and Yu-Ke Li and Hai-Yang Yang and Shan Jiang and Yongkang Luo and Zeng-Wei Zhu and Guang-Han Cao},
journal= {arXiv preprint arXiv:2006.09070},
year = {2020}
}