Domain fluctuations near the field-induced incommensurate-commensurate phase transition of TbMnO3

H. Barath, M. Kim, S. L. Cooper, P. Abbamonte, E. Fradkin, I. Mahns, M. Rübhausen, N. Aliouane, D. N. Argyriou

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We present temperature- and field-dependent inelastic light-scattering studies of multiferroic TbMnO3. By carefully examining the evolution of magneto-elastic modes in various phases of TbMnO3, our study reveals several features of the field-induced incommensurate-commensurate (IC-C) transition in TbMnO3. We find that, for fields applied along the b axis, there is a coexistence of distinct structural phases in the intermediate field regime (H=4-7 T) around the IC-C-phase transition. We present evidence for the existence of dynamical fluctuations of the C phase for fields lower than the critical field for H along the b axis, H<Hcb. Furthermore, we present evidence for strong spin-lattice coupling effects in TbMnO3 in the form of zone-boundary phonon modes that strongly couple to the spins by modulating the exchange interaction in this material.

Original languageEnglish (US)
Article number134407
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number13
StatePublished - Oct 10 2008

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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