Ye F, Fernandez-Baca J A, Fishman R S, Ren Y, Kang H J, Qiu Y, Kimura T
Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Phys Rev Lett. 2007 Oct 12;99(15):157201. doi: 10.1103/PhysRevLett.99.157201. Epub 2007 Oct 8.
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 J{2}/J{1} approximately 0.44 and J{3}/J{1} approximately 0.57), as well as out-of-plane coupling (J{z}, with J{z}/J{1} approximately 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.
利用高分辨率非弹性中子散射测量了几何阻挫三角晶格反铁磁体CuFeO₂的自旋波激发。为描述自旋波色散关系，需要考虑ab平面内直至第三近邻的反铁磁相互作用（J₁、J₂、J₃，其中J₂/J₁约为0.44，J₃/J₁约为0.57）以及面外耦合（Jz，其中Jz/J₁约为0.29），这表明磁相互作用具有三维特征。自旋波色散中的两个能量凹陷出现在与多铁性相相关的非公度波矢处，可解释为该系统中磁电行为的动态先兆。
