Polar distortion in ultrathin BaTiO3 films studied by in situ LEED I-V

Junsoo Shin; V. B. Nascimento; A. Y. Borisevich; E. W. Plummer; S. V. Kalinin; A. P. Baddorf

doi:10.1103/PhysRevB.77.245437

Polar distortion in ultrathin BaTiO3 films studied by in situ LEED I-V

Junsoo Shin, V. B. Nascimento, A. Y. Borisevich, E. W. Plummer, S. V. Kalinin, A. P. Baddorf

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

Phase stability in nanoscale ferroelectrics is governed by the interplay of electrostatic depolarization energy, domain formation, adsorption, and surface band bending. Using in situ low-energy electron-diffraction intensity versus voltage (LEED I-V), we have characterized 4 and 10 ML BaTiO3 films, grown using pulsed laser deposition with fully compressive strain on a SrRuO3/SrTiO3 substrate. LEED I-V reveals a single surface dead layer and a monodomain vertically polarized state below. The single orientation is attributed to the intrinsic imprint asymmetry and the stability of a polarized phase to compensation of depolarizing charges by dipoles induced by surface stress.

Original language	English
Article number	245437
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	77
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevB.77.245437
State	Published - Jun 25 2008

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abstract = "Phase stability in nanoscale ferroelectrics is governed by the interplay of electrostatic depolarization energy, domain formation, adsorption, and surface band bending. Using in situ low-energy electron-diffraction intensity versus voltage (LEED I-V), we have characterized 4 and 10 ML BaTiO3 films, grown using pulsed laser deposition with fully compressive strain on a SrRuO3/SrTiO3 substrate. LEED I-V reveals a single surface dead layer and a monodomain vertically polarized state below. The single orientation is attributed to the intrinsic imprint asymmetry and the stability of a polarized phase to compensation of depolarizing charges by dipoles induced by surface stress.",

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AU - Shin, Junsoo

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AU - Borisevich, A. Y.

AU - Plummer, E. W.

AU - Kalinin, S. V.

AU - Baddorf, A. P.

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AB - Phase stability in nanoscale ferroelectrics is governed by the interplay of electrostatic depolarization energy, domain formation, adsorption, and surface band bending. Using in situ low-energy electron-diffraction intensity versus voltage (LEED I-V), we have characterized 4 and 10 ML BaTiO3 films, grown using pulsed laser deposition with fully compressive strain on a SrRuO3/SrTiO3 substrate. LEED I-V reveals a single surface dead layer and a monodomain vertically polarized state below. The single orientation is attributed to the intrinsic imprint asymmetry and the stability of a polarized phase to compensation of depolarizing charges by dipoles induced by surface stress.

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Polar distortion in ultrathin BaTiO3 films studied by in situ LEED I-V

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