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Researchers observed an isostructural phase transition in epsilon oxygen under high pressure. This structural change at 18.1 GPa supports the predicted collapse of the molecular magnetic moment in oxygen (O_{2})_{4} units.

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Area of Science:

  • Solid-state physics
  • Materials science
  • High-pressure physics

Background:

  • Epsilon oxygen exhibits complex behavior under pressure.
  • Previous studies suggested a collapse of molecular magnetic moment based on spectroscopic data.

Purpose of the Study:

  • To structurally investigate the behavior of epsilon oxygen up to 30 GPa.
  • To provide structural evidence for the predicted collapse of the molecular magnetic moment.

Main Methods:

  • Single crystal X-ray diffraction measurements.
  • Compression experiments up to 30 GPa.

Main Results:

  • An isostructural phase transition was identified at 18.1±0.5 GPa.
  • Discontinuities in lattice parameters and intracluster distances (O8) were observed.
  • Changes in the equation of state indicate the transition.

Conclusions:

  • The structural transition supports the predicted collapse of the molecular magnetic moment in epsilon oxygen.
  • This provides the first structural substantiation for the magnetic moment collapse, complementing spectroscopic findings.