Hydrogen-rich materials are the most promising candidates for high-temperature conventional superconductors under ambient pressure. Multinary hydrides have abundant structural configurations and are more promising to find high-temperature superconductors at ambient pressure, but searching for multinary materials in complex phase space is a great challenge. In this work, we used our developed AI search engine (InvDesFlow) to perform extensive investigations regarding ambient stable superconducting hydrides. Several quaternary hydrides with high superconducting temperature~(Tc) are predicted. In particular, the superconducting Tc of K2GaCuH6 and K2LiCuH6 are calculated to be 68~K and 53~K under ambient pressure, respectively, which shows a significant enhancement in comparison with that of K2CuH6~(Tc∼ 16~K). We also find that intercalating atoms could cause phonon softening and induce more phonon modes with strong electron-phonon coupling. Hence, we propose that intercalating atoms is a feasible approach in searching for superconducting quaternary hydrides.
@article{arxiv.2508.10912,
title = {Superconductivity in atom-intercalated quaternary hydrides under ambient pressure},
author = {Bo-Wen Yao and Zhenfeng Ouyang and Xiao-Qi Han and Chang-Jiang Wu and Peng-Jie Guo and Ze-Feng Gao and Zhong-Yi Lu},
journal= {arXiv preprint arXiv:2508.10912},
year = {2025}
}