arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.10517cond-mat.str-elcond-mat.mtrl-sci
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电偶极子的涌现螺旋织构

Emergent helical texture of electric dipoles

Dmitry D. Khalyavin, Roger D. Johnson, Fabio Orlandi, Paolo G. Radaelli, Pascal Manuel, Alexei A. Belik

摘要:

大块材料中磁偶极子的长程有序性产生了广泛的磁结构,从简单的共线铁磁体和反铁磁体,到通过竞争交换相互作用稳定的复杂磁螺旋织构。相比之下,在介电晶体中的偶极顺序的上下文中,通常只考虑电偶极子的平行(铁电)和反平行(反铁电)共线排列。在这里,我们报告的电偶极子的光空穴掺杂的四重钙钛矿BiMn7O12的无公度螺旋秩序的观察。与磁性类似,电偶极螺旋织构也通过竞争不稳定性而稳定。具体而言,轨道排序和孤电子对立体化学活性竞争,引起从非手性立方结构到无公度电偶极子和轨道螺旋的相变,经由中间密度波。

英文摘要:

Long-range ordering of magnetic dipoles in bulk materials gives rise to a broad range of magnetic structures, from simple collinear ferromagnets and antiferromagnets, to complex magnetic helicoidal textures stabilized by competing exchange interactions. In contrast, in the context of dipolar order in dielectric crystals, only parallel (ferroelectric) and antiparallel (antiferroelectric) collinear alignments of electric dipoles are typically considered. Here, we report an observation of incommensurate helical ordering of electric dipoles by light hole-doping of the quadruple perovskite BiMn7O12. In analogy with magnetism, the electric dipole helicoidal texture is also stabilized by competing instabilities. Specifically, orbital ordering and lone electron pair stereochemical activity compete, giving rise to phase transitions from a non-chiral cubic structure, to an incommensurate electric dipole and orbital helix, via an intermediate density wave.

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