Pressure-induced superconductivity in the nonsymmorphic topological insulator KHgAs

Dai, Guangyang1,2; Jia, Yating1; Gao, Bo3,4; Peng, Yi1,5; Zhao, Jianfa1; Ma, Yanming3,4; Chen, Changfeng6; Zhu, Jinlong2; Li, Quan3,4; Yu, Runze1,7; Jin, Changqing1,5,8

2023-10-06

10.1038/s41427-023-00496-7

NPG ASIA MATERIALS   影响因子和分区

1884-4049

1884-4057

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 similar to 16 and 20 GPa, followed by the appearance of superconductivity with a T-c of similar to 3.5 K at approximately 21 GPa. The superconducting transition temperature was enhanced to a maximum of similar to 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.

SCI ; EI

英语

通讯

National Science Foundation["2022YFA1403800","2018YFA0305700","11921004","U2032220","T2325013","52288102","52090024","12034009"] ; Ministry of Science and Technology of China[2202059]

Materials Science

Materials Science, Multidisciplinary

WOS:001078964100001

NATURE PORTFOLIO

20234114876774

Electric insulators ; Quantum Hall effect ; Spin Hall effect ; Topological insulators ; Topology

Magnetism: Basic Concepts and Phenomena:701.2 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Classical Physics; Quantum Theory; Relativity:931 ; Crystal Lattice:933.1.1

2-s2.0-85173605187

Web of Science

1.Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
2.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
3.Jilin Univ, Coll Phys, State Key Lab Superhard Mat, Minist Educ, Changchun 130012, Peoples R China
4.Jilin Univ, Coll Phys, Key Lab Mat Simulat Methods & Software, Minist Educ, Changchun 130012, Peoples R China
5.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100190, Peoples R China
6.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA
7.Ctr High Pressure Sci & Technol Adv Res HPSTAR, Beijing 100094, Peoples R China
8.Songshan Lake Mat Lab, Dongguan 523808, Peoples R China

Dai, Guangyang,Jia, Yating,Gao, Bo,et al. Pressure-induced superconductivity in the nonsymmorphic topological insulator KHgAs[J]. NPG ASIA MATERIALS,2023,15(1).

Dai, Guangyang.,Jia, Yating.,Gao, Bo.,Peng, Yi.,Zhao, Jianfa.,...&Jin, Changqing.(2023).Pressure-induced superconductivity in the nonsymmorphic topological insulator KHgAs.NPG ASIA MATERIALS,15(1).

Dai, Guangyang,et al."Pressure-induced superconductivity in the nonsymmorphic topological insulator KHgAs".NPG ASIA MATERIALS 15.1(2023).