Journal
PHYSICAL REVIEW B
Volume 78, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.134407
Keywords
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Funding
- U.S. Department of Energy, Division of Materials Sciences [DE-FG02-07ER46453]
- Frederick Seitz Materials Research Laboratory at the University of Illinois
- National Science Foundation
- German funding agency [RU 773/3-1]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0758462] Funding Source: National Science Foundation
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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 < H-c(b). 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.
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