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Pressure induced superconductivity in pristine 1T-TiSe2.

A F Kusmartseva1, B Sipos, H Berger

  • 1Ecole Polytechnique Federale de Lausanne, IPMC, CH-1015 Lausanne, Switzerland.

Physical Review Letters
|April 7, 2010
PubMed
Summary

High pressure destabilizes the charge-density wave (CDW) state in 1T-TiSe(2), inducing superconductivity up to 4 GPa with a maximum transition temperature of 1.8 K. This contrasts with copper-intercalated samples, highlighting unique electronic state emergence.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity Research

Background:

  • The charge-density wave (CDW) state in 1T-TiSe(2) is known to compete with superconductivity.
  • Understanding the interplay between CDW and superconductivity is crucial for novel material design.

Purpose of the Study:

  • To investigate the emergence of superconductivity in pure 1T-TiSe(2) under high pressure.
  • To compare the pressure-induced superconducting phase with that in copper-intercalated 1T-TiSe(2).

Main Methods:

  • High-pressure study of pure 1T-TiSe(2) up to 10 GPa.
  • Measurements conducted between sub-Kelvin and room temperatures.

Main Results:

  • A superconducting phase was observed starting at 2 GPa and persisting up to 4 GPa.
  • The maximum superconducting transition temperature (Tc) reached was 1.8 K.
  • Two distinct superconducting domes were observed in 1T-TiSe(2) via different destabilization methods of the CDW state.

Conclusions:

  • High pressure is an effective method to induce superconductivity in 1T-TiSe(2).
  • The electronic state's emergence depends on how the CDW state is destabilized.
  • This system offers a unique platform to study competing orders and emergent phenomena.