Quadruple superstructure with antiferroic ionic displacements in B i1-x S mxFe O3

Y. Horibe, M. Nomoto, T. Inoshita, K. Watanabe, S. W. Cheong, Y. Inoue, Y. Koyama

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Abstract

Crystallographic and morphologic features of quadruple and double superstructures in Bi1-xSmxFeO3 with 0≤x≤0.40 were investigated by x-ray powder diffraction and transmission electron microscopy. The presence of a quadruple superstructure accompanied by antiferroic ionic displacements was found near the morphotropic phase boundary between the R3c phase (0<x<0.10) and the Pnma phase (0.25≤x≤0.40). The quadruple superlattice phase coexists with a ferroelectric R3c phase at x=0.15. These superstructures were found to originate from the freezing of multiple phonon modes related to transverse wave ionic displacements. These findings provide further insight towards understanding the complexity of rare-earth-doped BiFeO3.

Original languageEnglish
Article number024105
JournalPhysical Review B
Volume100
Issue number2
DOIs
Publication statusPublished - 2019 Jul 12

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Horibe, Y., Nomoto, M., Inoshita, T., Watanabe, K., Cheong, S. W., Inoue, Y., & Koyama, Y. (2019). Quadruple superstructure with antiferroic ionic displacements in B i1-x S mxFe O3. Physical Review B, 100(2), [024105]. https://doi.org/10.1103/PhysRevB.100.024105