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Surface phase transitions in BiFeO3 below room temperature

We combine a wide variety of experimental techniques to analyze two heretofore mysterious phase transitions in multiferroic bismuth ferrite at low temperature. Raman spectroscopy, resonant ultrasound spectroscopy, EPR, X-ray lattice constant measurements, conductivity and dielectric response, specif...

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Bibliographic Details
Published in:arXiv.org 2012-02
Main Authors: Jarrier, R, Marti, X, Herrero-Albillos, J, Ferrer, P, Haumont, R, Gemeiner, P, Geneste, G, Berthet, P, Schülli, T, Cvec, P, Blinc, R, Wong, Stanislaus S, Tae-Jin, Park, Alexe, M, Carpenter, M A, Scott, J F, Catalan, G, Dkhil, B
Format: Article
Language:English
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Summary:We combine a wide variety of experimental techniques to analyze two heretofore mysterious phase transitions in multiferroic bismuth ferrite at low temperature. Raman spectroscopy, resonant ultrasound spectroscopy, EPR, X-ray lattice constant measurements, conductivity and dielectric response, specific heat and pyroelectric data have been collected for two different types of samples: single crystals and, in order to maximize surface/volume ratio to enhance surface phase transition effects, BiFeO3 nanotubes were also studied. The transition at T=140.3K is shown to be a surface phase transition, with an associated sharp change in lattice parameter and charge density at the surface. Meanwhile, the 201K anomaly appears to signal the onset of glassy behaviour.
ISSN:2331-8422
DOI:10.48550/arxiv.1202.3387