We report on the superconductivity in ternary transition metal tellurides Ta2Pd3Te5 and Nb2Pd3Te5, which have a one-dimensional crystal structure. Single-crystalline and polycrystalline samples of Ta2Pd3Te5 show nonmetallic electron conduction, while Ti or W doping results in metallic behavior with a bulk superconducting transition at 2-4 K. In contrast, the polycrystalline samples of Nb2Pd3Te5, which are found to be isostructural to Ta2Pd3Te5, show a bulk superconducting transition at 3.3 K. The crystal structure and physical properties of Ta2Pd3Te5 and Nb2Pd3Te5 are also discussed in comparison with a candidate excitonic insulator Ta2NiSe5.
@article{arxiv.2105.01886,
title = {Superconductivity in Nb2Pd3Te5 and Chemically-Doped Ta2Pd3Te5},
author = {Naoya Higashihara and Yoshihiko Okamoto and Yuma Yoshikawa and Youichi Yamakawa and Hiroshi Takatsu and Hiroshi Kageyama and Koshi Takenaka},
journal= {arXiv preprint arXiv:2105.01886},
year = {2021}
}