Influence of doping on the spin dynamics and magnetoelectric effect in hexagonal Y 0.7 Lu 0.3 MnO 3
Influence of doping on the spin dynamics and magnetoelectric effect in hexagonal Y 0.7 Lu 0.3 MnO 3
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DOI：
10.1103/physrevb.89.144417
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发表时间：
2013-08
影响因子：
3.7
通讯作者：
W. Tian;G. Tan;Liu Liu-Liu;Jinxing Zhang;B. Winn;T. Hong;J. Fernandez-Baca;Chenglin Zhang;P. Dai
中科院分区：
文献类型：
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作者：
W. Tian;G. Tan;Liu Liu-Liu;Jinxing Zhang;B. Winn;T. Hong;J. Fernandez-Baca;Chenglin Zhang;P. Dai
我们用非弹性中子散射研究了Y_(0.7)_(Lu)_(0.3)_(MnO_3)_3中的自旋波及其与磁电效应的关联。在未掺杂的YMnO_3和LuMnO_3_3中，Mn的三聚畸变在决定磁结构和磁电效应中起着关键作用。在Y_(0.7)_(Lu)_(0.3)_(MnO_3)_3中，我们发现了一个小得多的面内(六方面元)单离子各向异性能隙，该能隙与面上较弱的介电反常相吻合。与YMnO和LuMnO相比，Y1-y中较小的面内各向异性间隙和较弱的面内介电反常都与较弱的Mn三聚失真相耦合，因此我们得出结论：Y1-y中的磁电效应和多铁性现象是由Mn三聚引起的。
We use inelastic neutron scattering to study spin waves and their correlation with the magnetoelectric effect in Y$_{0.7}$Lu$_{0.3}$MnO$_3$. In the undoped YMnO$_3$ and LuMnO$_3$, the Mn trimerization distortion has been suggested to play a key role in determining the magnetic structure and the magnetoelectric effect. In Y$_{0.7}$Lu$_{0.3}$MnO$_3$, we find a much smaller in-plane (hexagonal $ab$-plane) single ion anisotropy gap that coincides with a weaker in-plane dielectric anomaly at $T_N$. Since both the smaller in-plane anisotropy gap and the weaker in-plane dielectric anomaly are coupled to a weaker Mn trimerization distortion in Y$_{0.7}$Lu$_{0.3}$MnO$_3$ comparing to YMnO$_3$ and LuMnO$_3$, we conclude that the Mn trimerization is responsible for the magnetoelectric effect and multiferroic phenomenon in Y$_{1-y}$Lu$_{y}$MnO$_{3}$.