化学
超导电性
拓扑(电路)
拓扑绝缘体
拉曼光谱
凝聚态物理
同步辐射
费米面
费米能级
同步加速器
拓扑序
物理
光学
量子力学
组合数学
量子
电子
数学
作者
Hui Yu,Dayu Yan,Zhaopeng Guo,Yizhou Zhou,Xue Yang,Peiling Li,Zhijun Wang,Xiaojun Xiang,Junkai Li,Xiaoli Ma,Rui Zhou,Fang Hong,Yunxiao Wuli,Youguo Shi,Jian-Tao Wang,Xiaohui Yu
摘要
Topological insulators offer significant potential to revolutionize diverse fields driven by nontrivial manifestations of their topological electronic band structures. However, the realization of superior integration between exotic topological states and superconductivity for practical applications remains a challenge, necessitating a profound understanding of intricate mechanisms. Here, we report experimental observations for a novel superconducting phase in the pressurized second-order topological insulator candidate Ta2Pd3Te5, and the high-pressure phase maintains its original ambient pressure lattice symmetry up to 45 GPa. Our in situ high-pressure synchrotron X-ray diffraction, electrical transport, infrared reflectance, and Raman spectroscopy measurements, in combination with rigorous theoretical calculations, provide compelling evidence for the association between the superconducting behavior and the densified phase. The electronic state change around 20 GPa was found to modify the topology of the Fermi surface directly, which synergistically fosters the emergence of robust superconductivity. In-depth comprehension of the fascinating properties exhibited by the compressed Ta2Pd3Te5 phase is achieved, highlighting the extraordinary potential of topological insulators for exploring and investigating high-performance electronic advanced devices under extreme conditions.
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