Pressure-induced superconductivity in the weak topological insulator Bi2TeI and the topological metal Bi3TeI
Year: 2022
Type: preprint
Abstract: We report a series of high-pressure electrical transport, magnetic susceptibility, and x-ray diffraction measurements on single crystals of the weak topological insulator Bi2TeI and the topological metal Bi3TeI. Room temperature x-ray diffraction measurements show that both materials go through a series of pressure-induced structural transitions and eventually adopt a disordered bcc alloy structure at high pressure. A re-analysis of the published data on BiTeI indicates that this material also adopts a disordered bcc structure at high pressure, in contrast to the previously suggested P4/nmm structure. We find that Bi2TeI and Bi3TeI become superconducting at 13 GPa and 11.5 GPa, respectively. The superconducting critical temperature Tc of the bcc phase reaches maximum values of 7 K and 7.5 K for Bi2TeI and Bi3TeI, respectively and dTc/dP < 0 in both cases. The results indicate that disordered alloy bcc superconducting phases appear to be a universal feature of both the Bi-Te and Bi-Te-I systems at high pressure.
Source: arXiv (Cornell University)
Authors: Elmslie, T. A., VanGennep, D., Baten, R. N., Downing, J., Bi, W., Weir, S. T., Vohra, Y. K., Baumbach, R. E., Hamlin, J. J.
Language: English
Subfield: Geophysics
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, U.S. Department of Energy, National High Magnetic Field Laboratory, Office of Science, National Nuclear Security Administration, Division of Materials Research, High Magnetic Field Laboratory, Chinese Academy of Sciences, Argonne National Laboratory, State of Florida
Awards: G102163711, G107546177, G1120450653, G1313983767, G1664757510, G1696679194, CAREER: High Pressure Studies of Novel Quantum Phase Transitions, G2287611682, G2294341347, G2386482098, G262962599, G3075337988, G3318903820, G3330702905, G3589692066, G4624992917, G498139845, G502626589, G513797252, National High Magnetic Field Laboratory Renewal 2013-2017, Investigating Topology in Electronically Tailored Tetradymite Materials, G6671297155, G6711204355, G6848031779, G6918803902, DMREF: AI-Accelerated Design of Synthesis Routes for Metastable Materials, G956114762, G969889393, G993149817
OpenAlex ID: W2933812460