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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Europium Titanate (EuTiO3) is a magnetic semiconductor ideal for studying the anomalous Hall effect (AHE).
  • Its simple band structure allows Fermi level tuning to control AHE.
  • La-doping introduces spin-orbit interaction and Zeeman fields, creating complex electronic band structures with Weyl nodes.

Purpose of the Study:

  • To investigate the control of AHE in La-doped EuTiO3 by tuning the Fermi level.
  • To understand the influence of spin-orbit interaction and Zeeman fields on the electronic band structure and AHE.
  • To explore the nonmonotonic magnetic field dependence of AHE and its relation to Weyl nodes.

Main Methods:

  • High-mobility films of La-doped EuTiO3 were grown using gas source molecular beam epitaxy.
  • Anomalous Hall resistivity measurements were performed under varying magnetic fields.
  • Theoretical calculations were conducted to analyze the electronic band structure and the role of Zeeman splitting.

Main Results:

  • A nonmonotonic magnetic field dependence of anomalous Hall resistivity was observed.
  • Additional terms in AHE, not proportional to magnetization, were detected during magnetization.
  • Theoretical calculations confirmed that Zeeman field changes cause type II Weyl nodes to move, affecting AHE.

Conclusions:

  • The study reveals a unique magnetic field dependence of AHE in La-doped EuTiO3, driven by Zeeman splitting-induced Weyl node movement.
  • High-quality films with long electron scattering lifetimes are crucial for observing these effects.
  • EuTiO3 serves as a model system for controlling Berry curvature and AHE in multiband systems.