在SrTiO(001)上生长的GdMnO薄膜中的应变工程四方相和铁电性。
Strain-Engineered Tetragonal Phase and Ferroelectricity in GdMnO Thin Films Grown on SrTiO (001).
作者信息
Machado P, Figueiras F G, Vilarinho R, Fernandes J R A, Tavares P B, Soares M Rosário, Cardoso S, Silva J P B, Almeida A, Moreira J Agostinho
机构信息
IFIMUP and Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto. R. Campo Alegre, 687, 4169-007, Porto, Portugal.
CQVR & Physics Department, University of Trás-os-Montes e Alto-Douro, Ap. 1013, 5001-801, Vila Real, Portugal.
出版信息
Sci Rep. 2019 Dec 10;9(1):18755. doi: 10.1038/s41598-019-55227-2.
A previously unreported tetragonal phase has been discovered in a epitaxially strained GdMnO thin films deposited on (001)-oriented SrTiO substrates by radio frequency (RF) magnetron sputtering. The tetragonal axis of the films grown up to a 35 nm thickness is perpendicular to the film surface and the basal lattice parameters are imposed by the cubic structure of the substrate. Furthermore, the emergence of a spontaneous electric polarization below ~32 K points to the stabilization of an improper ferroelectric phase at low temperatures, which is not observed in bulk GdMnO. This work shows how strain engineering can be used to tailor the structure and properties of strongly correlated oxides.
通过射频（RF）磁控溅射在（001）取向的SrTiO衬底上沉积的外延应变GdMnO薄膜中发现了一种先前未报道的四方相。生长至35nm厚度的薄膜的四方轴垂直于薄膜表面，其基底晶格参数由衬底的立方结构决定。此外，在约32K以下出现的自发极化表明在低温下形成了一种非本征铁电相，而在块状GdMnO中未观察到这种现象。这项工作展示了如何利用应变工程来定制强关联氧化物的结构和性能。
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