Superconducting Bi2Te: Pressure-induced universality in the (Bi2)m(Bi2Te3)n series
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of Alabama, Birmingham, AL (United States)
Using high-pressure magnetotransport techniques we have discovered superconductivity in Bi2Te, a member of the infinitely adaptive (Bi2)m(Bi2Te3)n series, whose end members, Bi and Bi2Te3, can be tuned to display topological surface states or superconductivity. Bi2Te has a maximum Tc = 8.6 K at P = 14.5 GPa and goes through multiple high pressure phase transitions, ultimately collapsing into a bcc structure that suggests a universal behavior across the series. High-pressure magnetoresistance and Hall measurements suggest a semi-metal to metal transition near 5.4 GPa, which accompanies the hexagonal to intermediate phase transition seen via x-ray diffraction measurements. In addition, the linearity of Hc2 (T) exceeds the Werthamer-Helfand-Hohenberg limit, even in the extreme spin-orbit scattering limit, yet is consistent with other strong spin-orbit materials. Furthermore, considering these results in combination with similar reports on strong spin-orbit scattering materials seen in the literature, we suggest the need for a new theory that can address the unconventional nature of their superconducting states.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC52-07NA27344; NA0001974; FG02-99ER45775; AC02-06CH11357; NA0002014
- OSTI ID:
- 1247284
- Report Number(s):
- LLNL-JRNL--679788
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 9 Vol. 93; ISSN 2469-9950; ISSN PRBMDO
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
| Independence of topological surface state and bulk conductance in three-dimensional topological insulators 
 | journal | November 2018 | 
| Universal superconductivity phase diagram for pressurized tetradymite topological insulators 
 | journal | November 2018 | 
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