Magnetic Interactions in the Geometrically Frustrated Triangular Lattice Antiferromagnet ${\mathrm{CuFeO}}_{2}$

Magnetic Interactions in the Geometrically Frustrated Triangular Lattice Antiferromagnet ${CuFeO}_{2}$

F. Ye, J. A. Fernandez-Baca, R. S. Fishman, Y. Ren, H. J. Kang, Y. Qiu, and T. Kimura

Phys. Rev. Lett. 99, 157201 – Published 8 October 2007

Abstract

The spin-wave excitations of the geometrically frustrated triangular lattice antiferromagnet ${CuFeO}_{2}$ have been measured using high resolution inelastic neutron scattering. Antiferromagnetic interactions up to third nearest neighbors in the $a b$ plane ( $J_{1}$ , $J_{2}$ , $J_{3}$ , with $J_{2} / J_{1} \approx 0.44$ and $J_{3} / J_{1} \approx 0.57$ ), as well as out-of-plane coupling ( $J_{z}$ , with $J_{z} / J_{1} \approx 0.29$ ) 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.

Received 8 May 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.157201

Authors & Affiliations

F. Ye¹, J. A. Fernandez-Baca^1,2, R. S. Fishman³, Y. Ren⁴, H. J. Kang^5,6, Y. Qiu^5,6, and T. Kimura⁷

¹Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
²Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA
³Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
⁴Experimental Facilities Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
⁵NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
⁶Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
⁷Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan

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Vol. 99, Iss. 15 — 12 October 2007

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Physical Review Letters

Magnetic Interactions in the Geometrically Frustrated Triangular Lattice Antiferromagnet CuFeO2

F. Ye, J. A. Fernandez-Baca, R. S. Fishman, Y. Ren, H. J. Kang, Y. Qiu, and T. Kimura

Phys. Rev. Lett. 99, 157201 – Published 8 October 2007

Abstract

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Magnetic Interactions in the Geometrically Frustrated Triangular Lattice Antiferromagnet ${CuFeO}_{2}$