Pressure-induced superconductivity in the nonsymmorphic topological insulator KHgAs

IF 8.6 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Npg Asia Materials Pub Date : 2023-10-06 DOI:10.1038/s41427-023-00496-7
Guangyang Dai, Yating Jia, Bo Gao, Yi Peng, Jianfa Zhao, Yanming Ma, Changfeng Chen, Jinlong Zhu, Quan Li, Runze Yu, Changqing Jin
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Abstract

Abstract Recently, topological insulators (TIs) KHgX (X = As, Sb, Bi) with hourglass-shaped dispersion have attracted great interest. Different from the TIs protected by either time-reversal or mirror crystal symmorphic symmetry tested in previous experiments, these materials were proposed as the first material class whose band topology relies on nonsymmorphic symmetries. As a result, KHgX shows many exotic properties, such as hourglass-shaped electronic channels and three-dimensional doubled quantum spin Hall effects. To date, high-pressure experimental studies on these nonsymmorphic TIs are minimal. Here, we carried out high-pressure electrical measurements up to 55 GPa, together with high-pressure X-ray diffraction measurements and high-pressure structure prediction on KHgAs. We found a pressure-induced semiconductor-metal transition between ~16 and 20 GPa, followed by the appearance of superconductivity with a T c of ~3.5 K at approximately 21 GPa. The superconducting transition temperature was enhanced to a maximum of ~6.6 K at 31.8 GPa and then slowly decreased until 55 GPa. Furthermore, three high-pressure phases within 55 GPa were observed, and their crystal structures were established. Our results showed the high-pressure phase diagram of KHgAs and determined the pressure-induced superconductivity in nonsymmorphic TIs. Thus, our study can be used to facilitate further research on superconductivity and topologically nontrivial features protected by nonsymmorphic symmetries.

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非对称拓扑绝缘体KHgAs的压力诱导超导性
摘要近年来,具有沙漏状色散的拓扑绝缘体(TIs) KHgX (X = As, Sb, Bi)引起了人们的广泛关注。不同于以往实验中由时间反转或镜像晶体对称保护的ti,这些材料被认为是第一类带拓扑依赖于非对称对称的材料。因此,KHgX表现出许多奇异的特性,如沙漏形电子通道和三维双量子自旋霍尔效应。迄今为止,对这些非对称ti的高压实验研究很少。在这里,我们对KHgAs进行了高达55 GPa的高压电测量,以及高压x射线衍射测量和高压结构预测。我们发现在~16和20gpa之间出现了压力诱导的半导体-金属转变,随后在大约21gpa时出现了超导性,温度为~3.5 K。超导转变温度在31.8 GPa时达到~6.6 K,然后缓慢降低至55 GPa。在55 GPa范围内观察到3个高压相,并建立了它们的晶体结构。我们的结果显示了KHgAs的高压相图,并确定了非对称ti的压力诱导超导性。因此,我们的研究可以为进一步研究超导性和受非对称对称性保护的拓扑非平凡特征提供便利。
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来源期刊
Npg Asia Materials
Npg Asia Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
15.40
自引率
1.00%
发文量
87
审稿时长
2 months
期刊介绍: NPG Asia Materials is an open access, international journal that publishes peer-reviewed review and primary research articles in the field of materials sciences. The journal has a global outlook and reach, with a base in the Asia-Pacific region to reflect the significant and growing output of materials research from this area. The target audience for NPG Asia Materials is scientists and researchers involved in materials research, covering a wide range of disciplines including physical and chemical sciences, biotechnology, and nanotechnology. The journal particularly welcomes high-quality articles from rapidly advancing areas that bridge the gap between materials science and engineering, as well as the classical disciplines of physics, chemistry, and biology. NPG Asia Materials is abstracted/indexed in Journal Citation Reports/Science Edition Web of Knowledge, Google Scholar, Chemical Abstract Services, Scopus, Ulrichsweb (ProQuest), and Scirus.
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