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Title: Magnetic Interaction in the Geometrically Frustrated Triangular LatticeAntiferromagnet CuFeO2

Abstract

The spin wave excitations of the geometrically frustrated triangular lattice antiferromagnet (TLA) 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 deeps in the spin wave dispersion occur at the incommensurate wavevectors associated with multiferroic phase, and can be interpreted as dynamic precursors to the magnetoelectric behavior in this system.

Authors:
 [1];  [1];  [1];  [2];  [3];  [3];  [4]
  1. ORNL
  2. Argonne National Laboratory (ANL)
  3. National Institute of Standards and Technology (NIST)
  4. Los Alamos National Laboratory (LANL)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); High Flux Isotope Reactor
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1001705
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 99; Journal Issue: 15
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DISPERSION RELATIONS; NEUTRONS; RESOLUTION; SCATTERING; SPIN WAVES

Citation Formats

Ye, Feng, Fernandez-Baca, Jaime A, Fishman, Randy Scott, Ren, Y., Kang, H. J., Qiu, Y., and Kimura, T. Magnetic Interaction in the Geometrically Frustrated Triangular LatticeAntiferromagnet CuFeO2. United States: N. p., 2007. Web. doi:10.1103/PhysRevLett.99.157201.
Ye, Feng, Fernandez-Baca, Jaime A, Fishman, Randy Scott, Ren, Y., Kang, H. J., Qiu, Y., & Kimura, T. Magnetic Interaction in the Geometrically Frustrated Triangular LatticeAntiferromagnet CuFeO2. United States. doi:10.1103/PhysRevLett.99.157201.
Ye, Feng, Fernandez-Baca, Jaime A, Fishman, Randy Scott, Ren, Y., Kang, H. J., Qiu, Y., and Kimura, T. Mon . "Magnetic Interaction in the Geometrically Frustrated Triangular LatticeAntiferromagnet CuFeO2". United States. doi:10.1103/PhysRevLett.99.157201.
@article{osti_1001705,
title = {Magnetic Interaction in the Geometrically Frustrated Triangular LatticeAntiferromagnet CuFeO2},
author = {Ye, Feng and Fernandez-Baca, Jaime A and Fishman, Randy Scott and Ren, Y. and Kang, H. J. and Qiu, Y. and Kimura, T.},
abstractNote = {The spin wave excitations of the geometrically frustrated triangular lattice antiferromagnet (TLA) 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 deeps in the spin wave dispersion occur at the incommensurate wavevectors associated with multiferroic phase, and can be interpreted as dynamic precursors to the magnetoelectric behavior in this system.},
doi = {10.1103/PhysRevLett.99.157201},
journal = {Physical Review Letters},
number = 15,
volume = 99,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • 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.
  • The correct stacking of hexagonal layers is used to obtain accurate estimates for the exchange and anisotropy parameters of the geometrically-frustrated antiferromagnet CuFeO2. Those parameters are highly constrained by the stability of a collinear metamagnetic phase between fields of 13.5 and 20 T. Constrained fits of the spin-wave frequencies of the collinear ""## phase below 7 T are used to determine the magnetic unit cell of the metamagnetic """## phase, which contains two hexagonal layers and 10 Fe3+ ions. PACS numbers: 75.30.Ds, 75.50.Ee, 61.12.-q
  • 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{approx}0.44 and J3/J1{approx}0.57), as well as out-of-plane coupling (Jz, with Jz/J1{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.
  • This paper examines the relation between the spin-wave instabilities of collinear magnetic phases and the resulting non-collinear phases for a geometrically-frustrated triangular-lattice antiferromag- net in the high spin limit. Using a combination of phenomenological and Monte-Carlo techniques, we demonstrate that the instability wave-vector with the strongest intensity in the collinear phase determines the wave-vector of a cycloid or the dominant elastic peak of a more complex non-collinear phase. Our results are related to the observed multi-ferroic phase of Al-doped CuFeO2.
  • While a magnetic phase may be both locally stable and globally unstable, global stability always implies local stability. The distinction between local and global stability is studied on a geometrically-frustrated triangular lattice antiferromagnet with easy axis, single-ion anisotropy D along the z axis. Whereas the critical value Dloc c for local stability may be discontinuous across a phase boundary, the critical value Dglo c Dloc c for global stability must be continuous. We demonstrate this behavior across the phase boundary between collinear 3 and 4 sublattice phases that are stable for large D.