Molecular Hydride Superconductor BiH4 with Tc up to 91 K at 170 GPa

IF 14.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Pengfei Shan, Liang Ma, Xin Yang, Mei Li, Ziyi Liu, Jun Hou, Sheng Jiang, LiLi Zhang, Lifen Shi, Pengtao Yang, Chuanlong Lin, Bosen Wang, Jianping Sun, Haizhong Guo, Yang Ding, Huiyang Gou, Zhongxian Zhao, Jinguang Cheng
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Abstract

In pursuit of high-Tc hydride superconductors, the molecular hydrides have attracted less attention because the hydrogen quasimolecules are usually inactive for superconductivity. Here, we report on the successful synthesis of a novel bismuth hydride superconductor C2/c-BiH4 at pressures around 170–180 GPa. Its structure comprises bismuth atoms and elongated hydrogen molecules with a H–H bond length of 0.81 Å at 170 GPa, characterizing it as a typical molecular hydride. Transport measurements revealed the occurrence of superconductivity with Tc up to 91 K at 170 GPa, as evidenced by a sharp drop of resistivity to zero and a characteristic downward shift of Tc under magnetic fields. Calculations by density functional theory elucidate that both midfrequency H-derived phonons and low-frequency vibrations from Bi atoms are important for the strong electron–phonon coupling in BiH4, differentiating it from most high-Tc superconducting hydrides. Our work not only places C2/c-BiH4 among the molecular hydride superconductors with the highest Tc but also offers new directions for designing and synthesizing more high-Tc hydride superconductors.

Abstract Image

分子氢化物超导体BiH4, Tc在170 GPa下高达91 K
在追求高tc氢化物超导体方面,分子氢化物受到的关注较少,因为氢准分子通常不具有超导性。本文报道了一种新型氢化铋超导体C2/c-BiH4在170-180 GPa压力下的成功合成。其结构由铋原子和细长的氢分子组成,在170 GPa下H-H键长度为0.81 Å,是典型的分子氢化物。输运测量表明,在170 GPa下,Tc高达91 K时,超导现象出现,电阻率急剧下降至零,Tc在磁场下呈特征向下移动。密度泛函理论的计算表明,中频h衍生声子和来自Bi原子的低频振动对BiH4中的强电子-声子耦合很重要,这与大多数高tc超导氢化物不同。我们的工作不仅使C2/c-BiH4跻身于Tc最高的分子氢化物超导体之列,而且为设计和合成更高Tc的氢化物超导体提供了新的方向。
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来源期刊
CiteScore
24.40
自引率
6.00%
发文量
2398
审稿时长
1.6 months
期刊介绍: The flagship journal of the American Chemical Society, known as the Journal of the American Chemical Society (JACS), has been a prestigious publication since its establishment in 1879. It holds a preeminent position in the field of chemistry and related interdisciplinary sciences. JACS is committed to disseminating cutting-edge research papers, covering a wide range of topics, and encompasses approximately 19,000 pages of Articles, Communications, and Perspectives annually. With a weekly publication frequency, JACS plays a vital role in advancing the field of chemistry by providing essential research.
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