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Related Experiment Videos

Pressure-induced superconductivity in the giant Rashba system BiTeI.

D VanGennep1, A Linscheid, D E Jackson

  • 1Department of Physics, University of Florida, Gainesville, FL 32611, United States of America.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|December 23, 2016
PubMed
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Bismuth telluride iodide (BiTeI) becomes a superconductor at high pressures, exhibiting bulk superconductivity up to 6 Kelvin. This discovery reveals new potential for topological materials in superconductivity research.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Bismuth telluride iodide (BiTeI) displays a giant Rashba splitting at ambient pressure.
  • BiTeI transitions from a trivial to a topological insulator under low pressure.
  • High pressures induce two known structural transitions in BiTeI.

Purpose of the Study:

  • To investigate the properties of BiTeI at high pressures up to ~40 GPa.
  • To characterize the high-pressure phases of BiTeI, particularly focusing on superconductivity.
  • To determine the mechanism of superconductivity in high-pressure BiTeI.

Main Methods:

  • Electrical resistivity measurements under high pressure.
  • AC magnetic susceptibility measurements under high pressure.

Related Experiment Videos

  • Electronic structure and phonon calculations.

    • Main Results:

    • BiTeI exhibits superconductivity in its high-pressure orthorhombic P4/nmm phase.
    • Superconducting transition temperatures (Tc) as high as 6 K were observed.
    • AC magnetic susceptibility confirmed the bulk nature of the observed superconductivity.
    • Calculations suggest phonon-mediated superconductivity consistent with experimental data.

    Conclusions:

    • High-pressure BiTeI is a superconductor with bulk properties.
    • The superconductivity in BiTeI is likely mediated by phonons.
    • This work expands the understanding of pressure-induced superconductivity in topological materials.