Surface phase transitions in BiFeO3 below room temperature

Jarrier, R. and Marti, X. and Herrero-Albillos, J. and Ferrer, P. and Haumont, R. and Gemeiner, P. and Geneste, G. and Berthet, P. and Schülli, T. and Cvec, P. and Blinc, R. and Wong, Stanislaus S. and Park, Tae-Jin and Alexe, M. and Carpenter, M. A. and Scott, J. F. and Catalan, G. and Dkhil, B. (2012) Surface phase transitions in BiFeO3 below room temperature. arXiv:1202.3387.

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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.

Item Type: Article
Additional Information: Phys. Rev. B 85, 184104 (2012)
Uncontrolled Keywords: 2012AREP; IA63;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: arXiv:1202.3387
Depositing User: Sarah Humbert
Date Deposited: 27 Jun 2012 15:01
Last Modified: 23 Jul 2013 10:04

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