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arXiv 0810.5137cond-mat.mtrl-sci
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外延生长TbMnO3薄膜的铁磁性和离子性增强

Ferromagnetism and increased ionicity in epitaxially grown TbMnO3 films

D. Rubi, C. de Graaf, C. J. M. Daumont, D. Mannix, R. Broer, B. Noheda

摘要:

在SrTiO 3衬底上生长了TbMnO 3薄膜。薄膜在压缩应变下生长,并且仅部分地被夹在衬底上。这产生了显着的变化,在磁性能和,不像散装材料,薄膜显示铁磁相互作用低于40 K的有序温度。X射线光电子能谱测量表明,薄膜中Mn-3s的分裂比体材料大0.3eV。从头算嵌入式集群计算产生Mn-3S分裂,与实验一致,并揭示,较大的观测值是由于较大的离子性的薄膜。

英文摘要:

Thin films of TbMnO3 have been grown on SrTiO3 substrates. The films grow under compressive strain and are only partially clamped to the substrate. This produces remarkable changes in the magnetic properties and, unlike the bulk material, the films display ferromagnetic interactions below the ordering temperature of ~40K. X-ray photoemission measurements in the films show that the Mn-3s splitting is 0.3eV larger than that of the bulk. Ab initio embedded cluster calculations yield Mn-3s splittings that are in agreement with the experiment and reveal that the larger observed values are due to a larger ionicity of the films.

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