发表机构
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences; School of Science, Yanshan University; Institute of Quantum Materials and Physics, Henan Academy of Sciences; School of Physics, Beijing Institute of Technology; Center for High Pressure Science & Technology Advanced Research; School of Physics, University of Chinese Academy of Sciences（中国科学院物理研究所; 燕山大学理学院; 河南省科学院量子材料与物理研究所; 北京理工大学物理学院; 高压科学前沿中心; 中国科学院大学物理学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究实验合成了30 GPa下即可超导的Mg2RhH6，其Tc在30 GPa为24 K、53 GPa达29 K，为声子介导BCS框架下设计高温超导体提供了新路径。
AI 中文摘要
尽管近年来多氢化物超导体领域已取得巨大进展，但实现高临界温度超导仍依赖于极高的压力，因此在较低压力下寻找超导氢化物具有特别重要的意义。本文首次实验合成了Mg2RhH6，该化合物在大幅降低的30 GPa压力下即可实现超导。Mg2RhH6的合成通过两步过程完成：第一步制备含共价键稳定氢原子的前驱体Mg2RhH5；第二步补充氢，在30 GPa以上将电子填充到反键轨道，同时发生结构转变，从RhH5四方锥变为RhH6八面体。在30 GPa下，该材料的临界温度Tc为24 K，电阻率急剧降至零，且在施加磁场时Tc出现特征性抑制，证实了超导性；在53 GPa时，Tc进一步提升至29 K。实验证明Mg2RhH6超导体在30 GPa以上具有热力学稳定性，成为首个在易获得压力下Tc约为30 K的案例，该研究为在声子介导的BCS框架内合理设计和发现高温超导体开辟了极具前景的途径。
英文摘要
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.
Comments25 pages, 5 figures
Journal refJournal of the American Chemical Society,2026,148,36854
