极性与手性：来自竞争性磁结构不稳定性的功能性
Polarity vs Chirality: Functionality from competing magneto-structural instabilities
AI总结：
本文提出基于竞争自由能项的磁结构模型，解释立方四重钙钛矿中极性与手性畸变及磁致铁电性差异，并为多铁性功能设计提供新思路。
摘要：
我们报告了一种唯象磁结构模型，该模型基于相互竞争的自由能项；这些项依据磁矩的整体方向，耦合立方四重钙钛矿中的极性畸变或手性畸变。该模型自然解释了为何该材料体系中的某些化合物在低温下具有磁致铁电性，而另一些化合物（例如我们通过实验表征的 CaMn$_3$(Cr$_3$Mn)O$_{12}$）则没有。重要的是，我们的结果提出了一种发展实用多铁性功能的新途径，并且可推广到其他因空间反演而禁止子晶格间磁相互作用的多子晶格体系。
英文摘要：
We report a phenomenological magneto-structural model based on competing free-energy terms that couple either polar or chiral distortions in cubic quadruple perovskites, depending on the global direction of magnetic moments. The model naturally explains why some compounds in this material system host magnetically-induced ferroelectricity at low temperature, while others such as CaMn$_3$(Cr$_3$Mn)O$_{12}$, which we characterise experimentally, do not. Importantly, our results suggest a new approach towards developing an applied multiferroic functionality, and can be generalised to other multi-sublattice systems where the magnetic interaction between sublattices is prohibited by spatial inversion.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
