氢化物是实现室温超导的有希望的候选者，但将稳定压力降低到兆巴以下仍然是一个艰巨的挑战。
该项研究中，研究人员通过将非金属元素B引入La–H系统，成功合成了三元硼氢化镧，形成了坚固的B–H共价键，降低了稳定超导相所需的压力。电输运测量证实了在90GPa下具有高达106K的临界温度（Tc）的超导性的存在，如在外部磁场下的零电阻和Tc偏移所证明的。
X射线衍射和输运测量确定该超导化合物为LaB2H8，一种非板条氢化物，其晶体结构在低至半兆巴（59GPa）的压力下保持稳定。在亚毫巴压力范围内LaB2H8稳定超导化学计量标志着，在寻求多元氢化物中的高Tc超导性方面取得了实质性进展，使人们更接近环境压力条件。
附：英文原文
Title: Superconductivity above 105 K in Nonclathrate Ternary Lanthanum Borohydride below Megabar Pressure
Author: Xiaoxu Song, Xiaokuan Hao, Xudong Wei, Xin-Ling He, Hanyu Liu, Liang Ma, Guangtao Liu, Hongbo Wang, Jingyu Niu, Shaojie Wang, Yanpeng Qi, Zhongyuan Liu, Wentao Hu, Bo Xu, Lin Wang, Guoying Gao, Yongjun Tian
Issue&Volume: May 9, 2024
Abstract: Hydrides are promising candidates for achieving room-temperature superconductivity, but a formidable challenge remains in reducing the stabilization pressure below a megabar. In this study, we successfully synthesized a ternary lanthanum borohydride by introducing the nonmetallic element B into the La–H system, forming robust B–H covalent bonds that lower the pressure required to stabilize the superconducting phase. Electrical transport measurements confirm the presence of superconductivity with a critical temperature (Tc) of up to 106 K at 90 GPa, as evidenced by zero resistance and Tc shift under an external magnetic field. X-ray diffraction and transport measurements identify the superconducting compound as LaB2H8, a nonclathrate hydride, whose crystal structure remains stable at pressures as low as ～ half megabar (59 GPa). Stabilizing superconductive stoichiometric LaB2H8 in a submegabar pressure regime marks a substantial advancement in the quest for high-Tc superconductivity in polynary hydrides, bringing us closer to the ambient pressure conditions.
DOI: 10.1021/jacs.3c14205
