We report the synthesis, crystal structure, and physical properties of a novel ternary compound, Th2Cu4As5. The material crystallizes in a tetragonal structure with lattice parameters a=4.0716(1) {\AA} and c=24.8131(4) {\AA}. Its structure can be described as an alternating stacking of fluorite-type Th2As2 layers with antifluorite-type double-layered Cu4As3 slabs. The measurement of electrical resistivity, magnetic susceptibility and specific heat reveals that Th2Cu4As5 undergoes bulk superconducting transition at 4.2 K. Moreover, all these physical quantities exhibit anomalies at 48 K, where the Hall coefficient change the sign. These findings suggest a charge-density-wave-like (CDW) transition, making Th2Cu4As5 a rare example for studying the interplay between CDW and superconductivity.
@article{arxiv.2311.13308,
title = {Superconductivity and Charge-density-wave-like Transition in Th2Cu4As5},
author = {Qing-Chen Duan and Shao-Hua Liu and Bai-Zhuo Li and Jiao-Jiao Meng and Wu-Zhang Yang and Yi Liu and Yi-Qiang Lin and Si-Qi Wu and Jia-Yi Lu and Jin-Ke Bao and Yu-Sen Xiao and Xin-Yu Zhao and Yu-Xue Mei and Yu-Ping Sun and Dan Yu and Shu-Gang Tan and Qiang Jing and Rui-Dan Zhong and Yong-Liang Chen and Yong Zhao and Zhi Ren and Cao Wang and Guang-Han Cao},
journal= {arXiv preprint arXiv:2311.13308},
year = {2023}
}