论文标题
倾斜抗铁磁状态的多效性Bifeo $ _3 $的磁弹性失真
The Magnetoelastic Distortion of Multiferroic BiFeO$_3$ in the Canted Antiferromagnetic State
论文作者
论文摘要
使用THZ光谱法，我们表明，在其高场倾斜的抗磁性状态下，多性多型Bifeo $ _3 $的自旋波光谱得到了违反菱形对称性的自旋模型的很好描述。我们证明，倾斜的抗铁磁状态的单斜畸变是由晶格和两个几乎几乎反平行自旋之间的单离子磁弹性耦合诱导的。 Bifeo的修订旋转模型$ _3 $包含两个新的单离子各向异性术语，这些术语违反了菱形对称性，并取决于磁场的方向。
Using THz spectroscopy, we show that the spin-wave spectrum of multiferroic BiFeO$_3$ in its high-field canted antiferromagnetic state is well described by a spin model that violates rhombohedral symmetry. We demonstrate that the monoclinic distortion of the canted antiferromagnetic state is induced by the single-ion magnetoelastic coupling between the lattice and the two nearly anti-parallel spins. The revised spin model for BiFeO$_3$ contains two new single-ion anisotropy terms that violate rhombohedral symmetry and depend on the direction of the magnetic field.
