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Related Concept Videos

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Pressure-induced metallization in layered ReSe2.

P G Naumov1,2, M A ElGhazali1,3, H Mirhosseini1

  • 1Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|December 20, 2017
PubMed
Summary

High pressure transforms rhenium diselenide (ReSe2) into a metallic phase around 35 GPa. Superconductivity may arise from internal stresses, not intrinsic ReSe2 properties, under extreme compression.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Chemistry

Background:

  • Rhenium diselenide (ReSe2) is a layered transition metal dichalcogenide with a distorted crystal structure.
  • Understanding its behavior under extreme conditions is crucial for novel electronic applications.

Purpose of the Study:

  • To investigate the high-pressure structural and electrical properties of ReSe2.
  • To determine the pressure-induced phase transitions and metallization in ReSe2.
  • To explore the potential for superconductivity in compressed ReSe2.

Main Methods:

  • High-pressure Raman spectroscopy up to ~90 GPa.
  • Electrical resistivity measurements under varying loading conditions.
  • Ab initio electronic band structure calculations.

Main Results:

  • An isostructural phase transition due to layer sliding observed at ~7 GPa, stabilizing the distorted 1T-phase.
  • Pressure-induced metallization of ReSe2 occurs around 35 GPa, transitioning from a direct band gap semiconductor.
  • Emergence of superconductivity was observed, but likely attributed to internal stresses rather than intrinsic ReSe2 properties.

Conclusions:

  • ReSe2 exhibits significant structural and electronic property changes under high pressure.
  • The observed metallization and potential superconductivity are strongly influenced by pressure-induced stresses.