化学
镧
三元运算
超导电性
硼氢化
无机化学
有机化学
凝聚态物理
催化作用
物理
计算机科学
程序设计语言
作者
Xiao-Xu Song,Xiaokuan Hao,Xudong Wei,Xin‐Ling He,Hanyu Liu,Liang Ma,Guangtao Liu,Hongbo Wang,Jianye Niu,Shaojie Wang,Yanpeng Qi,Zhongyuan Liu,Wentao Hu,Bo Xu,Lin Wang,Guoying Gao,Yongjun Tian
摘要
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.
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