تقرير
Surface phase transitions in BiFeO3 below room temperature
| العنوان: | Surface phase transitions in BiFeO3 below room temperature |
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| المؤلفون: | 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., Park, Tae-Jin, Alexe, M., Carpenter, M. A., Scott, J. F., Catalan, G., Dkhil, B. |
| المصدر: | Phys. Rev. B 85, 184104 (2012) |
| سنة النشر: | 2012 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Condensed Matter - Other Condensed Matter |
| الوصف: | 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. Comment: submitted to PRB |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.85.184104 |
| URL الوصول: | http://arxiv.org/abs/1202.3387 |
| رقم الأكسشن: | edsarx.1202.3387 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.85.184104 |
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