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From latent ferroelectricity to hyperferroelectricity in alkali lead halide perovskites

Guido Roma, Arthur Marronnier, and Jacky Even
Phys. Rev. Materials 4, 092402(R) – Published 11 September 2020
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Abstract

Using first principles calculations we show that several alkali lead halides potentially present collective ferroelectric polarization. This should occur at least at the nanoscale; it could be detected macroscopically provided it is not concealed by lattice vibrations in the temperature range of stability of the cubic perovskite phase. For potassium lead halides and for alkali lead fluorides, remarkably, the ferroelectric behavior turns hyperferroelectric, suggesting a more robust ferroelectric polarization in spite of depolarization potentials induced by charge accumulation on surfaces or interfaces.

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  • Received 14 January 2020
  • Accepted 21 August 2020

DOI:https://doi.org/10.1103/PhysRevMaterials.4.092402

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Guido Roma*

  • Université Paris-Saclay, CEA, Service de Recherches de Métallurgie Physique, 91191 Gif sur Yvette, France

Arthur Marronnier

  • LPICM, CNRS, École Polytechnique, Université Paris-Saclay, F-91128 Palaiseau, France

Jacky Even

  • Univ Rennes, INSA Rennes, CNRS, Institut FOTON, UMR 6082, F-35000 Rennes, France

  • *guido.roma@cea.fr
  • Université Paris-Saclay, CEA, Service de Recherches de Métallurgie Physique, 91191 Gif sur Yvette, France.

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Issue

Vol. 4, Iss. 9 — September 2020

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