Pressure-induced superconductivity in weak topological insulator Bi<sub>2</sub>TeI and topological metal Bi<sub>3</sub>TeI
ORAL
Abstract
Using a newly developed system designed to rapidly screen materials for pressure-induced superconductivity we have performed a series of high pressure electrical transport and ac magnetic susceptibility measurements on single crystals of the weak topological insulator Bi2TeI and the topological metal Bi3TeI. Upon compression at low temperature, we find that Bi2TeI becomes superconducting at ∼13 GPa and Bi3TeI begins to superconduct at pressures above ∼11.5 GPa. The superconducting critical temperature Tc reaches maximum values of 7 K and 7.5 K for Bi2TeI and Bi3TeI, respectively. We observe distinct anomalies in the resistivity of both samples as a function of pressure, which may arise due to structural transitions.
*Supported by National Science Foundation (NSF) CAREER award DMR-1453752. Equipment development was partially supported by the NSF NHMFL UCGP. A portion of this work was performed at the National High Magnetic Field Laboratory (NHMFL), which is supported by NSF Cooperative Agreements No. DMR-1157490 and No. DMR-1644779 and the state of Florida. Designer diamond anvils were supported by DOE-NNSA Grant No. DE-NA0002928 and under the auspices of the US Department of Energy by Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344.
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Presenters
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James J. Hamlin
- Department of Physics, University of Florida