Soft phonon mode dynamics in Aurivillius-type structures

Deepam Maurya, Ali Charkhesht, Sanjeev K. Nayak, Fu Chang Sun, Deepu George, Abhijit Pramanick, Min Gyu Kang, Hyun Cheol Song, Marshall M. Alexander, Djamila Lou, Giti A. Khodaparast, S. P. Alpay, N. Q. Vinh, Shashank Priya

Research output: Contribution to journalArticle

5 Citations (Scopus)

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.

Original languageEnglish (US)
Article number134114
JournalPhysical Review B
Volume96
Issue number13
DOIs
StatePublished - Oct 18 2017

Fingerprint

Ferroelectricity
Atomic spectroscopy
Ferroelectric materials
Distribution functions
Cations
Positive ions
ferroelectricity
softening
Temperature
distribution functions
cations
temperature dependence
spectroscopy

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Maurya, D., Charkhesht, A., Nayak, S. K., Sun, F. C., George, D., Pramanick, A., ... Priya, S. (2017). Soft phonon mode dynamics in Aurivillius-type structures. Physical Review B, 96(13), [134114]. https://doi.org/10.1103/PhysRevB.96.134114
Maurya, Deepam ; Charkhesht, Ali ; Nayak, Sanjeev K. ; Sun, Fu Chang ; George, Deepu ; Pramanick, Abhijit ; Kang, Min Gyu ; Song, Hyun Cheol ; Alexander, Marshall M. ; Lou, Djamila ; Khodaparast, Giti A. ; Alpay, S. P. ; Vinh, N. Q. ; Priya, Shashank. / Soft phonon mode dynamics in Aurivillius-type structures. In: Physical Review B. 2017 ; Vol. 96, No. 13.
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Maurya, D, Charkhesht, A, Nayak, SK, Sun, FC, George, D, Pramanick, A, Kang, MG, Song, HC, Alexander, MM, Lou, D, Khodaparast, GA, Alpay, SP, Vinh, NQ & Priya, S 2017, 'Soft phonon mode dynamics in Aurivillius-type structures', Physical Review B, vol. 96, no. 13, 134114. https://doi.org/10.1103/PhysRevB.96.134114

Soft phonon mode dynamics in Aurivillius-type structures. / Maurya, Deepam; Charkhesht, Ali; Nayak, Sanjeev K.; Sun, Fu Chang; George, Deepu; Pramanick, Abhijit; Kang, Min Gyu; Song, Hyun Cheol; Alexander, Marshall M.; Lou, Djamila; Khodaparast, Giti A.; Alpay, S. P.; Vinh, N. Q.; Priya, Shashank.

In: Physical Review B, Vol. 96, No. 13, 134114, 18.10.2017.

Research output: Contribution to journalArticle

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AU - Maurya, Deepam

AU - Charkhesht, Ali

AU - Nayak, Sanjeev K.

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AU - George, Deepu

AU - Pramanick, Abhijit

AU - Kang, Min Gyu

AU - Song, Hyun Cheol

AU - Alexander, Marshall M.

AU - Lou, Djamila

AU - Khodaparast, Giti A.

AU - Alpay, S. P.

AU - Vinh, N. Q.

AU - Priya, Shashank

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Maurya D, Charkhesht A, Nayak SK, Sun FC, George D, Pramanick A et al. Soft phonon mode dynamics in Aurivillius-type structures. Physical Review B. 2017 Oct 18;96(13). 134114. https://doi.org/10.1103/PhysRevB.96.134114