Spin-Wave Instabilities and Noncollinear Magnetic Phases of a Geometrically Frustrated Triangular-Lattice Antiferromagnet

J. T. Haraldsen, M. Swanson, G. Alvarez, and R. S. Fishman
Phys. Rev. Lett. 102, 237204 – Published 12 June 2009

Abstract

This Letter examines the relation between the spin-wave instabilities of collinear magnetic phases and the resulting noncollinear phases for a geometrically frustrated triangular-lattice antiferromagnet 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 noncollinear phase. Our results are related to the observed multiferroic phase of Al-doped CuFeO2.

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  • Received 15 January 2009

DOI:https://doi.org/10.1103/PhysRevLett.102.237204

©2009 American Physical Society

Authors & Affiliations

J. T. Haraldsen1, M. Swanson1,2, G. Alvarez3, and R. S. Fishman1

  • 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 2Department of Physics, North Dakota State University, Fargo, North Dakota 58105, USA
  • 3Computer Science & Mathematics Division and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

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Issue

Vol. 102, Iss. 23 — 12 June 2009

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