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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
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Metastable ferroelectricity in optically strained SrTiO3.

T F Nova1,2, A S Disa3, M Fechner3

  • 1Max Planck Institute for the Structure and Dynamics of Matter, Hamburg 22761, Germany. tobia.nova@mpsd.mpg.de andrea.cavalleri@mpsd.mpg.de.

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Summary
This summary is machine-generated.

Optical excitation can induce a long-lasting polar order in strontium titanate (SrTiO3) quantum paraelectrics, demonstrating a photoinduced ferroelectric phase transition. This metastable phase persists for hours, even at room temperature.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Quantum paraelectricity

Background:

  • Fluctuating orders in solids often precede broken symmetry phases.
  • In some materials, like quantum paraelectric strontium titanate (SrTiO3), fluctuations persist to zero temperature, inhibiting long-range order.
  • SrTiO3 exhibits growing dipolar fluctuations upon cooling but does not achieve ferroelectric order.

Purpose of the Study:

  • To investigate the possibility of inducing polar order in strontium titanate (SrTiO3) via optical excitation.
  • To characterize the properties and persistence of the photoinduced polar phase.
  • To explore the underlying mechanisms, such as photoflexoelectric coupling, driving the photoinduced phase transition.

Main Methods:

  • Optical excitation of lattice vibrations in SrTiO3.
  • Temperature-dependent measurements to determine the stability of the induced polar phase.
  • Low-frequency vibration analysis to detect phase transitions.
  • Spatial domain distribution analysis.

Main Results:

  • Optical excitation successfully induced a metastable polar phase in SrTiO3.
  • This photoinduced polar phase was observed up to 290 Kelvin and persisted for hours after optical pump interruption.
  • Hardening of a low-frequency vibration indicated a photoinduced ferroelectric phase transition.
  • The observed domain distribution suggested a role for photoflexoelectric coupling.

Conclusions:

  • Optical excitation provides a route to induce and control polar order in quantum paraelectrics like SrTiO3.
  • A metastable, photoinduced ferroelectric phase can be achieved and maintained for extended periods.
  • Photoflexoelectric coupling is a likely mechanism contributing to the observed photoinduced ferroelectric phase transition.