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Strain energy is a fundamental concept in the field of materials science and structural engineering, describing the energy absorbed by a material or structure when it is deformed under load.
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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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Ferroelectricidad metastable en el SrTiO con tensión óptica

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.

Science (New York, N.Y.)
|June 15, 2019
PubMed
Resumen
Este resumen es generado por máquina.

La excitación óptica puede inducir un orden polar de larga duración en las paraeléctricas cuánticas de titanato de estroncio (SrTiO3), lo que demuestra una transición de fase fotoeléctrica inducida. Esta fase metastable persiste durante horas, incluso a temperatura ambiente.

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Área de la Ciencia:

  • Física de la materia condensada
  • Ciencias de los materiales
  • Paraelectricidad cuántica

Sus antecedentes:

  • Los órdenes fluctuantes en sólidos a menudo preceden a las fases de simetría rota.
  • En algunos materiales, como el titanato de estroncio paraeléctrico cuántico (SrTiO3), las fluctuaciones persisten hasta la temperatura cero, inhibiendo el orden de largo alcance.
  • El SrTiO3 exhibe fluctuaciones dipolares crecientes al enfriarse, pero no alcanza el orden ferroeléctrico.

Objetivo del estudio:

  • Investigar la posibilidad de inducir el orden polar en el titanato de estroncio (SrTiO3) mediante excitación óptica.
  • Caracterizar las propiedades y la persistencia de la fase polar fotoinducida.
  • Explorar los mecanismos subyacentes, como el acoplamiento fotoflexoeléctrico, que impulsa la transición de fase fotoinducida.

Principales métodos:

  • Excitación óptica de las vibraciones de la celosía en SrTiO3.
  • Mediciones dependientes de la temperatura para determinar la estabilidad de la fase polar inducida.
  • Análisis de vibraciones de baja frecuencia para detectar transiciones de fase.
  • Análisis de la distribución del dominio espacial.

Principales resultados:

  • La excitación óptica indujo con éxito una fase polar metastable en SrTiO3.
  • Esta fase polar fotoinducida se observó hasta 290 Kelvin y persistió durante horas después de la interrupción de la bomba óptica.
  • El endurecimiento de una vibración de baja frecuencia indicó una transición de fase fotoeléctrica inducida.
  • La distribución del dominio observado sugirió un papel para el acoplamiento fotoflexoeléctrico.

Conclusiones:

  • La excitación óptica proporciona una ruta para inducir y controlar el orden polar en paraeléctricos cuánticos como el SrTiO3.
  • Se puede lograr y mantener una fase ferroeléctrica fotoinducida metastable durante períodos prolongados.
  • El acoplamiento fotoflexoeléctrico es un mecanismo probable que contribuye a la transición de fase fotoeléctrica inducida observada.