发表机构
Saha Institute of Nuclear Physics, Homi Bhabha National Institute; Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research; Multiscale Microstructure and Mechanics of Materials Division, CSIR-Central Glass and Ceramic Research Institute（萨哈核物理研究所，霍米·巴巴国立研究所; 塔塔基础研究院凝聚态物理与材料科学系; 印度科学工业研究理事会中央玻璃与陶瓷研究所多尺度微观结构与材料力学部）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文报道了稀土正铁氧体单晶在自旋重取向转变温度以下沿c轴出现超过60-100%的巨磁致伸缩效应，源于磁场诱导的一级结构相变，为可逆大应变应用提供新可能。
AI 中文摘要
在磁致伸缩、压磁和铁磁形状记忆合金体系的整个范围内，伸缩效应的大小从几十个ppm（百万分之一）变化到几个百分点。本文报道了在正交晶系RFeO$_3$（R = Dy, Ho）单晶中，在其自旋重取向转变温度$T_{SR}$以下，沿$c$轴观察到前所未有的巨大磁场诱导晶格应变（在90 kOe磁场下超过60-100%）。然而，沿$a$和$b$轴的伸缩效应则小两个数量级。与磁致伸缩类似，磁介电效应表现出高度各向异性，且沿$c$轴非常显著。沿$c$轴如此巨大的伸缩和介电效应源于磁场诱导的一级结构相变，该相变可能源于大的自旋-轨道耦合（以及由此产生的巨大磁晶各向异性）。在稀土正铁氧体中观察到的巨伸缩效应可能为需要大且可逆的磁场诱导应变的应用开辟新的机遇。
英文摘要
Within the entire gamut of magnetostrictive, piezomagnetic, and ferromagnetic shape memory alloy systems, the striction effect is found to vary from a few tens of parts per million to a few percent. Here, we report the observation of an unprecedentedly large magnetic-field-induced lattice strain along the $c$ axis (more than 60-100% at 90 kOe field) in single crystals of orthorhombic $R$FeO$_3$ ($R$ = Dy, Ho) below their spin-reorientation transition temperature $T_{SR}$. However, the striction effect is two orders of magnitude smaller along the $a$ and $b$ axes. Like magnetostriction, the magnetodielectric effect is highly anisotropic and very large along the $c$ axis. Such gigantic striction and dielectric effects along the $c$ axis arise as a result of a magnetic-field-induced first-order structural phase transition which possibly stems from large spin-orbit coupling (and, thereby, enormous magnetocrystalline anisotropy). The observed colossal striction in rare-earth orthoferrites could open new opportunities for applications requiring large, reversible magnetic-field-induced strain.
Comments8 pages, 6 figures
