Superconducting Hydride Mg2RhH6 Experimentally Achieved at Lower Pressure
Abstract
Although tremendous progress has been made in recent years in the field of polyhydride superconductors, the realization of high critical temperature superconductivity still relies on formidable high pressures. Searching for superconducting hydrides at lower pressures is of particular importance. Here we report the first experimental synthesis of the Mg2RhH6, which achieves superconductivity under a significantly reduced pressure of 30 GPa. The synthesis of Mg2RhH6 proceeds via a two step process (1) preparation of the Mg2RhH5 precursor containing hydrogen atoms stabilized by covalent bonds, followed by (2) hydrogen supplementation resulting in the filling of electrons into anti bonding orbitals above 30 GPa, which was accompanied by the structural transition from RhH5 square pyramid to RhH6 octahedron. Superconductivity is achieved at 30 GPa with a Tc of 24 K, which is further enhanced to 29 K at 53 GPa, evidenced by a sharp drop of resistivity to zero and characteristic suppression of Tc under applied magnetic fields. Our experiments prove the Mg2RhH6 superconductor to be thermodynamically stable above 30 GPa, making it the first case exhibiting a Tc of approximately 30 K at a readily accessible pressure. This study pioneers a highly promising pathway for the rational design and discovery of high temperature superconductors within phonon mediated BCS framework.
Versions
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BibTeX
@misc{wu2026superconducting,
title = {{Superconducting Hydride Mg2RhH6 Experimentally Achieved at Lower Pressure}},
author = {Linjing Wu and Zelong Wang and Guiqi Liu and Jun Zhang and Yanfeng Ge and Yuanhao Su and Runteng Chen and Hongyu Liu and Wenmin Li and Sijia Zhang and Jingcheng Zhu and Jianfa Zhao and Zheng Deng and Shaomin Feng and Jing Song and Qingqing Liu and Xiang Li and Haozhe Liu and Panpan Kong and Xiancheng Wang and Changqing Jin},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2608.15745},
eprint = {2608.15745},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.15745},
}
RIS
TY - UNPB
TI - Superconducting Hydride Mg2RhH6 Experimentally Achieved at Lower Pressure
AU - Linjing Wu
AU - Zelong Wang
AU - Guiqi Liu
AU - Jun Zhang
AU - Yanfeng Ge
AU - Yuanhao Su
AU - Runteng Chen
AU - Hongyu Liu
AU - Wenmin Li
AU - Sijia Zhang
AU - Jingcheng Zhu
AU - Jianfa Zhao
AU - Zheng Deng
AU - Shaomin Feng
AU - Jing Song
AU - Qingqing Liu
AU - Xiang Li
AU - Haozhe Liu
AU - Panpan Kong
AU - Xiancheng Wang
AU - Changqing Jin
PY - 2026
DA - 2026/09/09
PB - arXiv
DO - 10.48550/arxiv.2608.15745
UR - https://arxiv.org/abs/2608.15745
AB - Although tremendous progress has been made in recent years in the field of polyhydride superconductors, the realization of high critical temperature superconductivity still relies on formidable high pressures. Searching for superconducting hydrides at lower pressures is of particular importance. Here we report the first experimental synthesis of the Mg2RhH6, which achieves superconductivity under a significantly reduced pressure of 30 GPa. The synthesis of Mg2RhH6 proceeds via a two step process (1) preparation of the Mg2RhH5 precursor containing hydrogen atoms stabilized by covalent bonds, followed by (2) hydrogen supplementation resulting in the filling of electrons into anti bonding orbitals above 30 GPa, which was accompanied by the structural transition from RhH5 square pyramid to RhH6 octahedron. Superconductivity is achieved at 30 GPa with a Tc of 24 K, which is further enhanced to 29 K at 53 GPa, evidenced by a sharp drop of resistivity to zero and characteristic suppression of Tc under applied magnetic fields. Our experiments prove the Mg2RhH6 superconductor to be thermodynamically stable above 30 GPa, making it the first case exhibiting a Tc of approximately 30 K at a readily accessible pressure. This study pioneers a highly promising pathway for the rational design and discovery of high temperature superconductors within phonon mediated BCS framework.
ER -