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Ferroelectric Exchange Bias Affects Interfacial Electronic States.

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Advanced Materials (Deerfield Beach, Fla.)
|June 9, 2020
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Researchers explored the LaAlO3/Ca-doped SrTiO3 interface, revealing how polar LaAlO3 induces an intrinsic bias. This bias influences superconducting properties and offers a new way to control ferroelectric materials for memory devices.

Keywords:
ferroelectricitygate biaspolar oxide interfacesscanning SQUIDsuperconductivity

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Chemistry

Background:

  • Polar oxide interfaces exhibit emergent phenomena like superconductivity and magnetism.
  • Ferroelectricity at interfaces can modulate these emergent properties, offering control mechanisms.

Purpose of the Study:

  • Investigate the LaAlO3/Ca-doped SrTiO3 interface to understand the interplay between polar and ferroelectric oxides.
  • Explore how intrinsic bias affects superconducting properties and ferroelectric behavior.

Main Methods:

  • Electrical transport measurements at low temperatures.
  • Scanning superconducting quantum interference device (SQUID) microscopy for local current imaging.

Main Results:

  • Observed anomalous interface resistivity behavior at low temperatures.
  • Scanning SQUID maps indicated an intrinsic bias from the polar LaAlO3 layer as the origin.
  • Demonstrated that intrinsic bias and ferroelectricity constrain structural domain tiling.

Conclusions:

  • The intrinsic bias in polar oxide interfaces is a key factor influencing emergent phenomena.
  • This bias can be leveraged to control and tune the initial state of ferroelectric materials.
  • The hysteretic dependence on gate voltage is promising for developing controllable memory devices.