Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevMaterials.3.024412
Title: Effect of phonon anharmonicity on ferroelectricity in EuxBa1-xTiO
Authors: Bommareddy Poojitha
Km Rubi 
Soumya Sarkar 
R. Mahendiran 
T. Venkatesan 
Surajit Saha 
Keywords: Ferroelectrics
Phonons
Perovskite
Raman Spectroscopy
X-ray Diffraction
Issue Date: 28-Feb-2019
Publisher: American Physical Society
Citation: Bommareddy Poojitha, Km Rubi, Soumya Sarkar, R. Mahendiran, T. Venkatesan, Surajit Saha (2019-02-28). Effect of phonon anharmonicity on ferroelectricity in EuxBa1-xTiO. Physical Review Materials 3 : 24412. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevMaterials.3.024412
Abstract: Investigating the competition between ferroelectric ordering and quantum fluctuations is essential for tailoring the desired functionalities of mixed ferroelectric and incipient ferroelectric systems, like, (Ba, Sr)TiO3 and (Eu,Ba)TiO3 . Recently, it has been shown that suppression of quantum fluctuations increases ferroelectric ordering in (Eu, Ba)TiO3 and since these phenomena are coupled to crystallographic phase transitions it is essential to understand the role of phonons. Here, we observe that the unusual temperature dependence of phonons in BaTiO3 gets suppressed when Ba2+ is replaced by Eu2+. This manifests in a decrease in the cubicto-tetragonal (i.e., para-to-ferroelectric) phase transition temperature (by 150 K) and a complete suppression of tetragonality of the lattice (at room temperature by 40% replacement of Ba2+ by Eu2+). We have quantified the anharmonicity of the phonons and observed that the replacement of Ba2+ by Eu2+ suppresses it (by 93%) with a resultant lowering of the ferroelectric ordering temperature in the EuxBa1-xTiO3. This suggests that tuning phonon anharmonicity can be an important route to ferroelectric materials.
Source Title: Physical Review Materials
URI: https://scholarbank.nus.edu.sg/handle/10635/189161
ISSN: 24759953
DOI: 10.1103/PhysRevMaterials.3.024412
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