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Superconductor

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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Superconductivity Bordering Rashba Type Topological Transition.

M L Jin1, F Sun1,2, L Y Xing1

  • 1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

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|January 5, 2017
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Summary
This summary is machine-generated.

This study demonstrates pressure-induced transitions in a spin-orbit interaction (SOI) compound, BiTeI. It transitions from a topological trivial phase to a topological insulator, then to superconductivity, revealing unique quantum phenomena.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Phenomena

Background:

  • Strong spin-orbit interaction (SOI) is key to unique quantum phenomena like topological insulators, the Rashba effect, and p-wave superconductivity.
  • Integrating these phenomena into a single material offers significant scientific potential.
  • BiTeI is a compound known for its spin-orbit interaction properties.

Purpose of the Study:

  • To investigate the possibility of combining topological insulator, Rashba effect, and superconductivity in a single material.
  • To explore pressure-induced quantum phase transitions in the spin-orbit interaction compound BiTeI.
  • To understand the relationship between structural changes and observed quantum phenomena under pressure.

Main Methods:

  • Electrical resistivity measurements to detect phase transitions.
  • Application of hydrostatic pressure to tune the material's properties.
  • X-ray structure refinements to analyze structural changes.
  • Hall Effect measurements to study carrier density and transport properties.

Main Results:

  • Observed consecutive quantum phase transitions in BiTeI under pressure.
  • A transition from a Rashba type topological trivial phase to a topological insulator state at 2 GPa, evidenced by V-shaped resistivity changes due to band inversion.
  • Superconducting transition initiated at 8 GPa with a critical temperature (TC) of 5.3 K.
  • Structural analysis revealed pressure-correlated changes in Bi-Te bond lengths and angles.
  • Hall Effect measurements indicated a link between superconductivity and unusual carrier density variations, suggesting unconventional superconductivity.

Conclusions:

  • BiTeI exhibits sequential quantum phase transitions under pressure, transitioning from a topological trivial state to a topological insulator and finally to a superconducting state.
  • The observed transitions are strongly correlated with pressure-induced structural modifications.
  • The interplay between carrier density changes and superconductivity suggests potential for unconventional superconducting mechanisms in BiTeI.