超导电性
无定形固体
凝聚态物理
多形性
结晶
相(物质)
材料科学
相变
从头算
物理
结晶学
热力学
量子力学
化学
作者
Kai Zhang,Ming Xu,Nana Li,Meng Xu,Qian Zhang,Eran Greenberg,Vitali B. Prakapenka,Yu Sheng Chen,Matthias Wuttig,Ho-kwang Mao,Wenge Yang
标识
DOI:10.1103/physrevlett.127.127002
摘要
Superconductivity and Anderson localization represent two extreme cases of electronic behavior in solids. Surprisingly, these two competing scenarios can occur in the same quantum system, e.g., in an amorphous superconductor. Although the disorder-driven quantum phase transition has attracted much attention, its structural origins remain elusive. Here, we discovered an unambiguous correlation between superconductivity and density in amorphous ${\mathrm{Sb}}_{2}{\mathrm{Se}}_{3}$ at high pressure. Superconductivity first emerges in the high-density amorphous (HDA) phase at about 24 GPa, where the density of glass unexpectedly exceeds its crystalline counterpart, and then shows an enhanced critical temperature when pressure induces crystallization at 51 GPa. Ab initio simulations reveal that the bcc-like local geometry motifs form in the HDA phase, arising from distinct ``metavalent bonds.'' Our results demonstrate that HDA phase is critical for the incipient superconductive behavior.
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