Magnetic Interactions in the Geometrically Frustrated Triangular Lattice Antiferromagnet CuFeO{sub 2}
- Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
- Experimental Facilities Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531 (Japan)
The spin-wave excitations of the geometrically frustrated triangular lattice antiferromagnet CuFeO{sub 2} have been measured using high resolution inelastic neutron scattering. Antiferromagnetic interactions up to third nearest neighbors in the ab plane (J{sub 1}, J{sub 2}, J{sub 3}, with J{sub 2}/J{sub 1}{approx_equal}0.44 and J{sub 3}/J{sub 1}{approx_equal}0.57), as well as out-of-plane coupling (J{sub z}, with J{sub z}/J{sub 1}{approx_equal}0.29) are required to describe the spin-wave dispersion relations, indicating a three-dimensional character of the magnetic interactions. Two energy dips in the spin-wave dispersion occur at the incommensurate wave vectors associated with multiferroic phase and can be interpreted as dynamic precursors to the magnetoelectric behavior in this system.
- OSTI ID:
- 21024271
- Journal Information:
- Physical Review Letters, Vol. 99, Issue 15; Other Information: DOI: 10.1103/PhysRevLett.99.157201; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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