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In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
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Random Field Driven Spatial Complexity at the Mott Transition in VO(2).

Shuo Liu1, B Phillabaum1, E W Carlson1

  • 1Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA.

Physical Review Letters
|February 6, 2016
PubMed
Summary
This summary is machine-generated.

Critical cluster techniques reveal the Mott metal-insulator transition in vanadium dioxide is near random field Ising model criticality. This explains the material's robust hysteresis.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Vanadium dioxide (VO2) exhibits a metal-insulator transition (MIT) with significant hysteresis.
  • Understanding the fundamental mechanisms driving this MIT is crucial for advanced electronic applications.

Purpose of the Study:

  • To apply critical cluster techniques to analyze the Mott metal-insulator transition in vanadium dioxide.
  • To investigate the relationship between the observed nanoscale phase separation and theoretical models of criticality.

Main Methods:

  • Utilized scanning near-field infrared microscopy to observe nanoscale metallic and insulating regions (puddles).
  • Applied critical cluster techniques to analyze the geometric universal properties of these puddles.
  • Compared experimental observations with predictions from the random field Ising model.

Main Results:

  • Observed geometric universal properties of metallic and insulating puddles in VO2.
  • These properties are consistent with the system approaching criticality of the random field Ising model.
  • Identified large barriers to equilibrium, potentially explaining the robust hysteresis in VO2's MIT.

Conclusions:

  • The Mott metal-insulator transition in vanadium dioxide behaves near the criticality of the random field Ising model.
  • Critical cluster analysis provides a framework for understanding nanoscale phase coexistence.
  • The findings offer insights into the origin of hysteresis in vanadium dioxide.