MnSb2O6：具有手性晶体结构的极性磁体
MnSb2O6: A polar magnet with a chiral crystal structure
摘要：
结构和磁性手性被发现共存于一小群材料中，它们产生有趣的现象，如最近发现的skyrmion相。在这里，我们描述了一个以前未知的表现，这种相互作用的MnSb2O6，具有手性晶体结构的三角氧化物。与所有其他已知的情况不同，MnSb2O6的磁性结构是基于同向旋转的摆线而不是螺旋。与结构手性的耦合由与所谓的矢量手性相关的磁轴向矢量提供。我们表明，这种独特的安排是磁基态的磁交换哈密顿量，从头计算的海森堡交换相互作用的基础上，并稳定的面外各向异性。MnSb_2O_6具有多铁性，具有独特的铁电开关机制。
英文摘要：
Structural and magnetic chiralities are found to coexist in a small group of materials in which they produce intriguing phenomenologies such as the recently discovered skyrmion phases. Here, we describe a previously unknown manifestation of this interplay in MnSb2O6, a trigonal oxide with a chiral crystal structure. Unlike all other known cases, the MnSb2O6 magnetic structure is based on co-rotating cycloids rather than helices. The coupling to the structural chirality is provided by a magnetic axial vector, related to the so-called vector chirality. We show that this unique arrangement is the magnetic ground state of the symmetric-exchange Hamiltonian, based on ab-initio theoretical calculations of the Heisenberg exchange interactions, and is stabilised by out-of-plane anisotropy. MnSb2O6 is predicted to be multiferroic with a unique ferroelectric switching mechanism.
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