BiMnO $_3$的磁基态和多铁性
Magnetic ground state and multiferroicity in BiMnO$_3$
摘要：
我们认为，中心对称的$C2/c$在BiMnO $_3$的对称性是自发打破反铁磁（AFM）相互作用存在于系统中。真正的对称性预计是$Cc$，这是兼容的非共线磁基态，其中沿一个晶轴的铁磁顺序与隐藏的AFM顺序共存，并与它沿其他两个轴的铁电极化。磁场$B \sim 35$ Tesla可以恢复$C2/c$的对称性，它关闭铁电极化。我们的分析是基于低能量模型的解决方案构建的3d能带的BiMnO $_3$，其中所有的参数已来自第一性原理计算。测试计算的同构BiCrO $_3$显示与实验数据的良好协议。
英文摘要：
We argue that the centrosymmetric $C2/c$ symmetry in BiMnO$_3$ is spontaneously broken by antiferromagnetic (AFM) interactions existing in the system. The true symmetry is expected to be $Cc$, which is compatible with the noncollinear magnetic ground state, where the ferromagnetic order along one crystallographic axis coexists with the the hidden AFM order and related to it ferroelectric polarization along two other axes. The $C2/c$ symmetry can be restored by the magnetic field $B \sim 35$ Tesla, which switches off the ferroelectric polarization. Our analysis is based on the solution of the low-energy model constructed for the 3d-bands of BiMnO$_3$, where all the parameters have been derived from the first-principles calculations. Test calculations for isostructural BiCrO$_3$ reveal an excellent agreement with experimental data.
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