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Non-Fermi liquids in oxide heterostructures.

Susanne Stemmer1, S James Allen2

  • 1Materials Department, University of California, Santa Barbara, CA 93106-5050, United States of America.

Reports on Progress in Physics. Physical Society (Great Britain)
|April 14, 2018
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Summary

Strongly correlated materials exhibit anomalous transport. Oxide heterostructures like strontium titanate and rare earth nickelates offer new insights into non-Fermi liquid behavior and metal-insulator transitions.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Solid-state physics

Background:

  • Anomalous transport in strongly correlated materials presents significant challenges.
  • Phenomena include metal-insulator transitions and deviations from Fermi liquid theory.
  • Oxide heterostructures are emerging as key platforms for studying these complex systems.

Purpose of the Study:

  • To investigate unconventional transport phenomena in oxide thin film systems.
  • To explore strong correlation physics using strontium titanate and rare earth nickelate heterostructures.
  • To understand the emergence of non-Fermi liquid behavior and its dependence on heterostructure parameters.

Main Methods:

  • Focus on charge carriers in strontium titanate (SrTiO3) layers and interfaces.
  • Examine strained rare earth nickelate thin films.
  • Analyze the influence of heterostructure parameters, lattice symmetry, and disorder.

Main Results:

  • Doped SrTiO3 layers exhibit complex, yet well-behaved, electron gas or Fermi liquid characteristics.
  • Rare earth nickelates represent a highly correlated electron system, potentially classifiable as a non-Fermi liquid.
  • Insights into the physics driving non-Fermi liquid behavior are gained through systematic study.

Conclusions:

  • Oxide heterostructures provide crucial platforms for understanding strongly correlated electron systems.
  • The study of SrTiO3 and rare earth nickelates reveals diverse transport behaviors.
  • Lattice symmetry and disorder play significant roles in metal-insulator transitions within these heterostructures.