Anomalous low-energy phonons in nearly tetragonal BiFeO3 thin films
- Authors
- Choi, K. -Y.; Do, S. H.; Lemmens, P.; Wulferding, D.; Woo, C. S.; Lee, J. H.; Chu, K.; Yang, C. -H.
- Issue Date
- Oct-2011
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.84, no.13
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 84
- Number
- 13
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/21173
- DOI
- 10.1103/PhysRevB.84.132408
- ISSN
- 1098-0121
- Abstract
- We present evidence for a concomitant structural and ferroelectric transformation around T-S similar to 360 K in multiferroic BiFeO3/LaAlO3 thin films close to the tetragonal phase. Phonon excitations are investigated by using Raman scattering as a function of temperature. The low-energy phonon modes at 180-260 cm(-1) related to the FeO6 octahedron tilting show anomalous behaviors upon cooling through T-S: (i) a large hardening amounting to 15 cm(-1), (ii) an increase of intensity by one order of magnitude, and (iii) an appearance of a dozen new modes. In contrast, the high-frequency modes exhibit only weak anomalies. This suggests an intimate coupling of octahedron tilting to ferroelectricity leading to a simultaneous change of structural and ferroelectric properties.
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Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
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