论文标题
eutio3膜中对称性限制的多效性行为
Multiferroic behavior confined by symmetry in EuTiO3 films
论文作者
论文摘要
我们阐明了在拉伸紧张的EUTIO3膜中多效特征的旋转，晶格，电荷和轨道耦合机制。由氧八人体倾斜确定的对称性塑造了欧盟4F和Ti 3D轨道之间的杂交，这抑制了预测的Ti位移适当的铁电性。取而代之的是，声子软化在伪立方体（110）平面内的低温下出现，这与预期的铁电偏振对称性正交。另外，磁各向异性是由Ti 3D和通常各向同性EU2+ 4F之间的杂交确定的轨道失真。这种独特的场景证明了对称性在定义多表情行为的顺序参数耦合中的关键作用。
We have elucidated the spin, lattice, charge and orbital coupling mechanism underlying the multiferroic character in tensile strained EuTiO3 films. Symmetry determined by oxygen octahedral tilting shapes the hybridization between the Eu 4f and Ti 3d orbitals and this inhibits predicted Ti displacement proper ferroelectricity. Instead, phonon softening emerges at low temperatures within the pseudo-cube (110) plane, orthogonal to the anticipated ferroelectric polarization symmetry. Additionally, the magnetic anisotropy is determined by orbital distortion through hybridization between the Ti 3d and typically isotropic Eu2+ 4f. This unique scenario demonstrates the critical role symmetry plays in the coupling of order parameters defining multiferroic behaviour.
