Soft phonon mode dynamics in Aurivillius-type structures

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

12 Scopus Citations
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Author(s)

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

Detail(s)

Original languageEnglish
Article number134114
Journal / PublicationPhysical Review B
Volume96
Issue number13
Publication statusPublished - 18 Oct 2017

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.

Citation Format(s)

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: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review