title: Spin-wave instabilities and noncollinear magnetic phases of a geometrically frustrated triangular-lattice antiferromagnet.
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.
authors: Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors: J T
authors: JT
authors: Haraldsen
authors: M
authors: M
authors: Swanson
authors: G
authors: G
authors: Alvarez
authors: R S
authors: RS
authors: Fishman