Pressure-induced structural transitions, alloying and superconductivity in topological insulators Bi2Te2Se and Bi2Se2Te

Cheng, Hu1; Xu, Yixuan1,2; Zhou, Xuefeng3; Gong, Yu1; Yang, Dongliang1; Li, Xiaodong1; Li, Yanchun1

2022-08-01

10.1039/d2dt01545e

DALTON TRANSACTIONS   影响因子和分区

1477-9226

1477-9234

Over the past decade, external pressure has been found to play an important role in modulating the structures and properties of sesqui-chalcogenides, but several key puzzles still remain to be solved. In this work, pressure-induced structural phase transitions, alloying and topological superconductivity in the ternary tetradymites Bi2Te2Se and Bi2Se2Te were investigated via in situ high-pressure angle-dispersive X-ray diffraction and resistance measurements. Both of them transform from the layered rhombohedral R3m structure to a 7-fold monoclinic C2/m phase, then to an 8-fold monoclinic C2/c structure, and eventually to a bcc alloy, which are quite different from previous work, but similar to the transitions in Bi2Te3. The superconductivity was found in the rhombohedral structure of Bi2Se2Te with T-c approximate to 2.2 K at 4.3 GPa, which should be related to the topological quantum transition. Furthermore, the atomic size and element electronegativity were discovered to have a significant effect on the alloying and amorphization of these compounds.

SCI ; EI

英语

其他

National Natural Science Foundation of China[12104457]

Chemistry

Chemistry, Inorganic & Nuclear

WOS:000852668400001

ROYAL SOC CHEMISTRY

20224513067016

Alloying ; Bismuth ; Bismuth alloys ; Chalcogenides ; Chemical bonds ; Crystal structure ; Electronegativity ; Topology

Metallurgy:531.1 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Physical Chemistry:801.4 ; Electrochemistry:801.4.1 ; Inorganic Compounds:804.2 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Crystal Lattice:933.1.1

CHEMISTRY

Web of Science

1.Chinese Acad Sci, Multidisciplinary Res Ctr, Inst High Energy Phys, Beijing 100049, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China

Cheng, Hu,Xu, Yixuan,Zhou, Xuefeng,et al. Pressure-induced structural transitions, alloying and superconductivity in topological insulators Bi2Te2Se and Bi2Se2Te[J]. DALTON TRANSACTIONS,2022,51:14630-14638.

Cheng, Hu.,Xu, Yixuan.,Zhou, Xuefeng.,Gong, Yu.,Yang, Dongliang.,...&Li, Yanchun.(2022).Pressure-induced structural transitions, alloying and superconductivity in topological insulators Bi2Te2Se and Bi2Se2Te.DALTON TRANSACTIONS,51,14630-14638.

Cheng, Hu,et al."Pressure-induced structural transitions, alloying and superconductivity in topological insulators Bi2Te2Se and Bi2Se2Te".DALTON TRANSACTIONS 51(2022):14630-14638.