Soft phonon mode dynamics in Aurivillius-type structures

Title
Soft phonon mode dynamics in Aurivillius-type structures
Authors
송현철Deepam MauryaAli CharkheshtSanjeev K. NayakFu-Chang SunDeepu GeorgeAbhijit PramanickMin-Gyu KangMarshall M. AlexanderDjamila LouGiti A. KhodaparastS. P. AlpayN. Q. VinhShashank Priya
Issue Date
2017-10
Publisher
Physical review B, Condensed matter and materials physics
Citation
VOL 96, NO 13-134114-9
Abstract
We report the dynamics of soft phonon modes and their role toward various structural transformations in Aurivillius materials by employing terahertz frequency-domain spectroscopy, atomic pair distribution function analysis, and first-principles calculations. We have chosen Bi4Ti3O12 as a model system and identified soft phonon modes associated with the paraelectric tetragonal to the ferroelectric monoclinic transition. Three soft phonon modes have been discovered that exhibit a strong temperature dependence. We have determined that the anharmonicity in Bi-O bonds plays a significant role in phonon softening, and that Bi cations play an important role in the emergence of ferroelectricity.
URI
http://pubs.kist.re.kr/handle/201004/66326
ISSN
2469-9950
Appears in Collections:
KIST Publication > Article
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