Two-phonon coupling to the antiferromagnetic phase transition in multiferroic BiFeO3

Mariola O. Ramirez; M. Krishnamurthi; S. Denev; A. Kumar; Seung-Yeul Yang; Ying-Hao Chu; Eduardo Saiz; Jan Seidel; A. P Pyatakov; A. Bush; D. Viehland; J. Orenstein; R. Ramesh; Venkatraman Gopalan

doi:10.1063/1.2829681

Two-phonon coupling to the antiferromagnetic phase transition in multiferroic BiFeO3

Other Condensed Matter 2009-11-13 v1

Authors: Mariola O. Ramirez , M. Krishnamurthi , S. Denev , A. Kumar , Seung-Yeul Yang , Ying-Hao Chu , Eduardo Saiz , Jan Seidel , A. P Pyatakov , A. Bush , D. Viehland , J. Orenstein , R. Ramesh , Venkatraman Gopalan

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Abstract

A prominent band centered at around 1000-1300 cm-1 and associated with resonant enhancement of two-phonon Raman scattering is reported in multiferroic BiFeO3 thin films and single crystals. A strong anomaly in this band occurs at the antiferromagnetic Neel temperature. This band is composed of three peaks, assigned to 2A4, 2E8, and 2E9 Raman modes. While all three peaks were found to be sensitive to the antiferromagnetic phase transition, the 2E8 mode, in particular, nearly disappears at TN on heating, indicating a strong spin-two phonon coupling in BiFeO3.

Keywords

phonon physics phonon modes and lattice dynamics

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@article{arxiv.0712.0368,
  title  = {Two-phonon coupling to the antiferromagnetic phase transition in multiferroic BiFeO3},
  author = {Mariola O. Ramirez and M. Krishnamurthi and S. Denev and A. Kumar and Seung-Yeul Yang and Ying-Hao Chu and Eduardo Saiz and Jan Seidel and A. P Pyatakov and A. Bush and D. Viehland and J. Orenstein and R. Ramesh and Venkatraman Gopalan},
  journal= {arXiv preprint arXiv:0712.0368},
  year   = {2009}
}

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12 pages with figures

Two-phonon coupling to the antiferromagnetic phase transition in multiferroic BiFeO3

Abstract

Keywords

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