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Evidence for a surface anomaly during the cubic-tetragonal phase transition in BaTiO 3 (001)

N. Barrett 1 J. Dionot 1 D. Martinotti 2 E. Salje 3 C. Mathieu 1
1 LENSIS - Laboratoire d'Etude des NanoStructures et Imagerie de Surface
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
2 LEPO - Laboratoire d'Electronique et nanoPhotonique Organique
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
Abstract : We have used low energy electron microscopy (LEEM) to study the evolution of the surface structure of BaTiO3(001) during the ferroelectric-paraelectric phase transition (120 °C, P4mm-Pm3m). Transient surface structures appear under heating at temperatures slightly above TC. Intersections between polar domain walls and the sample surface persist in the surface layer at 126.0 °C while the bulk has already transformed into the cubic phase. The wall signals are criss-crossed by a second set of stripe patterns with roughly perpendicular orientation at 126.3 °C. These surface patterns coarsen under further heating to 126.9 °C. The LEEM image is dominated in the ferroelectric state by intersections of ferroelastic/ferroelectric 90° walls and the surface. The intersection lines are charged.
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https://hal.archives-ouvertes.fr/hal-01872198
Contributor : Dominique Girard <>
Submitted on : Tuesday, September 11, 2018 - 5:00:04 PM
Last modification on : Monday, February 10, 2020 - 6:13:46 PM

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N. Barrett, J. Dionot, D. Martinotti, E. Salje, C. Mathieu. Evidence for a surface anomaly during the cubic-tetragonal phase transition in BaTiO 3 (001). Applied Physics Letters, American Institute of Physics, 2018, 113 (2), ⟨10.1063/1.5030498⟩. ⟨hal-01872198⟩

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