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Updated: Nov 4, 2025

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
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Gate-tuned anomalous Hall effect driven by Rashba splitting in intermixed LaAlO3/GdTiO3/SrTiO3.

N Lebedev1, M Stehno2, A Rana3,4

  • 1Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA, Leiden, The Netherlands.

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|May 22, 2021
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Summary

The Anomalous Hall Effect (AHE) in oxide heterostructures can arise from paramagnetism, not just ferromagnetism. This study shows AHE linked to a Lifshitz transition and Rashba spin-orbit coupling changes.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Oxide Heterostructures

Background:

  • The Anomalous Hall Effect (AHE) is crucial for understanding 2D electron systems in oxide heterostructures.
  • AHE is often linked to ferromagnetism, but paramagnetic contributions are increasingly recognized.

Purpose of the Study:

  • Investigate the influence of magnetic ions on AHE in LaAlO3/GdTiO3/SrTiO3 heterostructures.
  • Determine the relationship between AHE, magnetic properties, and electronic transitions.

Main Methods:

  • Measurements of intermixed LaAlO3/GdTiO3/SrTiO3 heterostructures at low temperatures (<10 K).
  • Application of gate voltage to induce electronic transitions and observe AHE.
  • Analysis of magnetic properties to identify ferromagnetism or paramagnetism.

Main Results:

  • An onset of AHE was observed concurrent with a Lifshitz transition induced by gate voltage.
  • No clear signs of ferromagnetism were detected in the studied system.
  • A correlation between AHE and changes in Rashba spin-orbit coupling at the Lifshitz transition was found.

Conclusions:

  • AHE in these systems can be driven by paramagnetic moments, particularly at low temperatures and high magnetic fields.
  • The observed AHE is attributed to altered Rashba spin-orbit coupling during the Lifshitz transition.
  • Paramagnetic contributions to AHE must be considered when analyzing carrier densities and mobilities in such heterostructures.