Haraldsen J T, Swanson M, Alvarez G, Fishman R S
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Phys Rev Lett. 2009 Jun 12;102(23):237204. doi: 10.1103/PhysRevLett.102.237204.
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.
本信函研究了在高自旋极限下，几何失配三角晶格反铁磁体的共线磁相的自旋波不稳定性与由此产生的非共线相之间的关系。通过结合唯象学和蒙特卡罗技术，我们证明了共线相中强度最强的不稳定性波矢决定了摆线的波矢或更复杂非共线相的主导弹性峰的波矢。我们的结果与观察到的Al掺杂CuFeO2的多铁性相有关。
