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Related Concept Videos

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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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Related Experiment Video

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Fabrication of Spatially Confined Complex Oxides
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Percolation via Combined Electrostatic and Chemical Doping in Complex Oxide Films.

Peter P Orth1, Rafael M Fernandes1, Jeff Walter2

  • 1School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.

Physical Review Letters
|March 25, 2017
PubMed
Summary
This summary is machine-generated.

This study reveals how bulk dopants and surface charges interact to induce percolation in complex oxide thin films like La_{1-x}Sr_{x}CoO_{3} (LSCO). Thin films require less surface charge for percolation, enhancing ferromagnetism and guiding experiments.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Thin Film Physics

Background:

  • Electrolyte gating enables new methods for manipulating material properties.
  • Complex oxides like La_{1-x}Sr_{x}CoO_{3} (LSCO) exhibit interesting electronic and magnetic behaviors.
  • Percolation phenomena are crucial for understanding conductivity and phase transitions in inhomogeneous materials.

Purpose of the Study:

  • To theoretically investigate percolation in inhomogeneous complex oxide thin films.
  • To understand the combined effects of bulk chemical doping and surface electrostatic doping.
  • To explore the impact on percolation thresholds and associated phenomena like ferromagnetism.

Main Methods:

  • Numerical and analytical investigations.
  • Modeling of thin films with inhomogeneous properties.
  • Analysis of bulk and surface doping effects on percolation.

Main Results:

  • Identified two percolation mechanisms: bulk-assisted surface percolation and surface-assisted bulk percolation.
  • Demonstrated that bulk dopants significantly reduce the required surface charge for percolation.
  • Showed critical surface charge dependence on film thickness near the chemical percolation threshold.
  • Observed enhanced saturation magnetization due to magnetic clusters extending from surface to bulk in LSCO.

Conclusions:

  • Thin films can be driven to percolation with modest surface charge densities.
  • The interplay between bulk and surface doping offers tunable control over material properties.
  • Findings provide guidance for experimental verification of gate-induced percolation transitions in complex oxides.