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High pressure transforms magnetic topological insulator EuSn2As2 into a new structure, exhibiting an insulator-metal-superconductor transition and superconductivity up to 30.8 GPa.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Chemistry

Background:

  • EuSn2As2 is a layered crystal with a Bi2Te3-type structure.
  • It is known as an intrinsic magnetic topological insulator under ambient conditions.

Purpose of the Study:

  • To investigate the structural and electronic properties of EuSn2As2 under high pressure.
  • To identify new structural phases and their associated physical phenomena.

Main Methods:

  • Ab initio calculations were employed to predict structural changes.
  • In situ x-ray diffraction measurements were used to confirm structural transitions.
  • Phonon mode analysis verified dynamic structural stability.
  • Electrical resistance measurements probed electronic properties and phase transitions.

Main Results:

  • A new monoclinic EuSn2As2 structure (C2/m symmetry) was identified above ~14 GPa.
  • This high-pressure phase features a 3D network of interconnected Sn and As atoms.
  • An insulator-metal-superconductor transition was observed around 5 and 15 GPa.
  • Superconductivity with a critical temperature (Tc) of ~4 K was detected up to 30.8 GPa.

Conclusions:

  • High pressure induces significant structural reconstruction in EuSn2As2.
  • The new high-pressure phase exhibits novel electronic properties, including superconductivity.
  • This study expands the understanding of layered magnetic topological insulators under extreme conditions.