中心对称BiMnO $_3$中磁转变的结构异常
Structural anomalies at the magnetic transition in centrosymmetric BiMnO$_3$
摘要：
从中子粉末衍射数据作为温度和磁场的函数的BiMn $O_3$的结构特性被确定。在所有温度下的结构被发现是中心对称的空间群$C2/c$，这是不相容的铁电性。在T $_C\simeq 100 K$，我们观察到一个大的磁致弹性应变的发病，成正比的磁化的平方。我们解释这种结构重排，连同先前观察到的磁介电异常，由于需要优化部分受挫的磁相互作用。
英文摘要：
The structural properties of BiMn$O_3$ were determined from neutron powder diffraction data as a function of temperature and magnetic field. The structure at all temperatures was found to be centrosymmetric with space group $C2/c$, which is incompatible with ferroelectricity. At T$_C\simeq 100 K$, we observed the onset of a large magnetoelastic strain, proportional to the square of the magnetization. We interpret this structural rearrangement, together with the previously observed magnetodielectric anomalies, as due to the need to optimize the partially frustrated magnetic interactions.
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