Magnetic Interactions in the Geometrically Frustrated Triangular Lattice Antiferromagnet CuFeO2

Journal Article · Sun Dec 31 23:00:00 EST 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.99.157201· OSTI ID:941607

Ye, Feng ^[1]; Fernandez-Baca, Jaime A ^[1]; Fishman, Randy Scott ^[1]; Ren, Y ^[2]; Qiu, Y ^[3]; Kimura, T ^[4]

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1. ORNL
2. Argonne National Laboratory (ANL)
3. National Institute of Standards and Technology (NIST)
4. Osaka University

The spin-wave excitations of the geometrically frustrated triangular lattice antiferromagnet CuFeO2 have been measured using high resolution inelastic neutron scattering. Antiferromagnetic interactions up to third nearest neighbors in the ab plane (J1, J2, J3, with J2=J1 0:44 and J3=J1 0:57), as well as out-of-plane coupling (Jz, with Jz=J1 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.

• Research Organization: Oak Ridge National Laboratory (ORNL); High Flux Isotope Reactor
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 941607
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 157201 Vol. 99; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DISPERSION RELATIONS
NEUTRONS
RESOLUTION
SCATTERING
VECTORS