Superconductivity in Nb2Pd3Te5 and Chemically-Doped Ta2Pd3Te5
Naoya Higashihara, Yoshihiko Okamoto, Yuma Yoshikawa, Youichi, Yamakawa, Hiroshi Takatsu, Hiroshi Kageyama, and Koshi Takenaka
TL;DR
This paper investigates superconductivity in the one-dimensional transition metal tellurides Nb2Pd3Te5 and Ta2Pd3Te5, revealing doping-induced metallicity and superconducting transitions around 3-4 K, and compares their properties with related materials.
Contribution
It reports the discovery of superconductivity in Nb2Pd3Te5 and doped Ta2Pd3Te5, highlighting the effects of chemical doping and structural similarities with related compounds.
Findings
Superconductivity observed at 3.3 K in Nb2Pd3Te5.
Doping induces metallic behavior and superconductivity in Ta2Pd3Te5.
Structural and physical property comparisons with Ta2NiSe5.
Abstract
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.
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