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

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Abstract

A prominent band centered at ∼1000-1300 cm-1 and associated with resonant enhancement of two-phonon Raman scattering is reported in multiferroic BiFe O3 thin films and single crystals. A strong anomaly in this band occurs at the antiferromagnetic Neel temperature, TN ∼375 °C. This band is composed of three peaks, assigned to 2 A4, 2 E8, and 2 E9 Raman modes. While all three peaks were found to be sensitive to the antiferromagnetic phase transition, the 2 E8 mode, in particular, nearly disappears at TN on heating, indicating a strong spin-two-phonon coupling in BiFe O3.

Original languageEnglish (US)
Article number022511
JournalApplied Physics Letters
Volume92
Issue number2
DOIs
StatePublished - 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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