标题： 单轴压缩的正交晶系HoMnO3薄膜的多铁性能 显示英文标题

标题： Multiferroic properties of uniaxially compressed orthorhombic HoMnO3 thin films

摘要： 正交晶系HoMnO3（Pbnm空间群）的多铁性能在沿a轴的外延压缩应变下显著改变。我们能够通过使用YAlO3（010）基底，仅关注沿a轴的应变效应，该基底在其他面内方向（c轴）与HoMnO3只有很小的晶格失配。应变和弛豫的HoMnO3薄膜的多铁性能与块体材料的性能进行比较，发现存在很大差异。弛豫薄膜表现出类似块体的特性，如铁电相变温度为25 K，在39 K以下具有非公度反铁磁序，其序波矢为（0 qb 0），在10 K时qb ~ 0.41。应变薄膜在37.5 K时就表现出铁电性，并且在10 K时具有qb ~ 0.49的非公度磁序。 显示英文摘要

摘要： Multiferroic properties of orthorhombic HoMnO3 (Pbnm space group) are significantly modified by epitaxial compressive strain along the a-axis. We are able to focus on the effect of strain solely along the a-axis by using an YAlO3 (010) substrate, which has only a small lattice mismatch with HoMnO3 along the other in-plane direction (the c-axis). Multiferroic properties of strained and relaxed HoMnO3 thin films are compared with those reported for bulk, and are found to differ widely. A relaxed film exhibits bulk-like properties such as a ferroelectric transition temperature of 25 K and an incommensurate antiferromagnetic order below 39 K, with an ordering wave vector of (0 qb 0) with qb ~ 0.41 at 10 K. A strained film becomes ferroelectric already at 37.5 K and has an incommensurate magnetic order with qb ~ 0.49 at 10 K.