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Oxygen Displacement in Cuprates under Ionic Liquid Field-Effect Gating.

Guy Dubuis1,2,3, Yizhak Yacoby4, Hua Zhou5

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This summary is machine-generated.

Applying gate voltage to La1.96Sr0.04CuO4 films induced structural changes, including surface disorder and oxygen displacement, only when positive voltage depleted holes, making the film more insulating.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Epitaxial growth of thin films like La1.96Sr0.04CuO4 (LSCO) on substrates such as LaSrAlO4 (LSAO) is crucial for electronic device applications.
  • Understanding structural responses to external stimuli, like electric fields, is key to controlling material properties.
  • Ionic liquid gating is a powerful technique for inducing large electric fields in thin films.

Purpose of the Study:

  • To investigate the structural modifications in a La1.96Sr0.04CuO4 film under ultra-high electric fields induced by ionic liquid gating.
  • To determine the three-dimensional electron density and atomic positions within the film, buffer layer, and substrate.
  • To correlate structural changes with variations in electrical properties (insulating vs. metallic states).

Main Methods:

  • Epitaxial growth of a 5-unit-cell-thick La1.96Sr0.04CuO4 film on a LaSrAlO4 substrate with a single-unit-cell buffer layer.
  • Ionic liquid gating to induce ultra-high electric fields by applying gate voltage.
  • X-ray diffraction intensity measurements along substrate-defined Bragg rods.
  • Phase retrieval analysis to reconstruct the 3D electron density.

Main Results:

  • Negative gate voltage (hole injection, metallic state) caused no structural changes.
  • Positive gate voltage (hole depletion, insulating state) led to electric field penetration, surface monolayer disorder, and displacement of equatorial oxygen atoms towards the surface.
  • These surface structural changes were reversible upon applying a negative voltage.
  • The c-axis lattice constant of the film remained unchanged despite oxygen displacements.

Conclusions:

  • Ionic liquid gating can induce significant, reversible structural changes in La1.96Sr0.04CuO4 films.
  • The observed structural modifications are strongly dependent on the film's electronic state (metallic vs. insulating).
  • The results highlight the interplay between electronic and structural properties in correlated oxide films under electric fields.