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Tuning dimensionality in van-der-Waals antiferromagnetic Mott insulators TMPS3.

M J Coak1, D M Jarvis2, H Hamidov2,3,4

  • 1Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, United Kingdom.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 27, 2019
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Summary

We explored tuning the dimensionality of 2D van-der-Waals antiferromagnets, (Transition-Metal)PS3. Applying pressure induced structural transitions and Mott insulator behavior, revealing metallic states with quantum critical potential.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Low-dimensional van-der-Waals antiferromagnetic compounds, specifically (Transition-Metal)PS3, offer unique platforms for fundamental physics research.
  • Their properties are sensitive to dimensionality, which can be tuned via exfoliation or hydrostatic pressure.

Purpose of the Study:

  • To investigate the effects of dimensionality control on the structural, magnetic, and electronic properties of (Transition-Metal)PS3 compounds.
  • To explore the evolution of these materials from 2D to 3D under hydrostatic pressure.

Main Methods:

  • Electrical transport measurements
  • Raman scattering spectroscopy
  • Synchrotron X-ray diffraction
  • Theoretical calculations

Main Results:

  • Hydrostatic pressure induces common structural transitions across measured (Transition-Metal)PS3 materials.
  • These transitions are linked to Mott insulator-to-metal transitions at high pressures.
  • Magnetotransport and resistivity data in high-pressure metallic states indicate potential for quantum critical phenomena.

Conclusions:

  • Dimensionality tuning, particularly via pressure, is an effective strategy to modify the physical properties of van-der-Waals antiferromagnets.
  • The observed high-pressure metallic states in (Transition-Metal)PS3 compounds warrant further investigation into low-temperature transport and quantum criticality.