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Updated: Sep 16, 2025

A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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Non-steady-state optothermal electromotive force in relaxor ferroelectrics.

M A Bryushinin1, S G Lushnikov2, I A Sokolov2

  • 1Ioffe Institute, St. Petersburg, Russia. mb@mail.ioffe.ru.

Scientific Reports
|July 11, 2025
PubMed
Summary

Researchers predict and observe a novel optothermal electromotive force effect in relaxor ferroelectrics. This discovery in lead nickel tantalate crystals opens new avenues for understanding optoelectronic phenomena in advanced materials.

Keywords:
Non-steady-state photo-EMFRelaxor ferroelectricThermopolarization effect

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Optoelectronics

Background:

  • Relaxor ferroelectrics exhibit unique dielectric properties, including a frequency-dependent permittivity maximum.
  • The transition to a relaxor ferroelectric state is associated with remanent polarization below a specific temperature range.
  • Understanding the interplay between optical and electrical properties in these materials is crucial for device applications.

Purpose of the Study:

  • To predict and experimentally verify a new non-steady-state optothermal electromotive force (EMF) effect.
  • To investigate this effect in a specific relaxor ferroelectric crystal, PbNi[Formula: see text]Ta[Formula: see text]O[Formula: see text].
  • To analyze the high-frequency behavior and develop a theoretical framework for the observed optothermal EMF.

Main Methods:

  • Experimental observation of the optothermal EMF effect using laser irradiation at a specific wavelength (532 nm).
  • Characterization of the PbNi[Formula: see text]Ta[Formula: see text]O[Formula: see text] crystal's electrical conductivity and EMF response under non-uniform laser heating.
  • Development of a theoretical model to explain the observed phenomena, focusing on the mismatch between EMF and conductivity.

Main Results:

  • Successful prediction and observation of a non-steady-state optothermal EMF effect in relaxor ferroelectrics.
  • The effect was studied at room temperature, significantly above the permittivity maximum (around 180 K).
  • A significant mismatch was found between the high-frequency EMF and conductivity responses, attributed to nonuniform laser heating.

Conclusions:

  • The study confirms a novel optothermal EMF effect in relaxor ferroelectrics, expanding the understanding of their optoelectronic properties.
  • The findings highlight the importance of considering non-uniform heating effects in optoelectronic measurements of ferroelectric materials.
  • The developed theory provides a foundation for further research into optothermal phenomena in advanced functional materials.