Evolvement of atomic diffusion and corresponding effect in La0.7Sr0.3MnO3/SrTiO3 superlattice
Evolvement of atomic diffusion and corresponding effect in La0.7Sr0.3MnO3/SrTiO3 superlattice
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La0.7Sr0.3MnO3/SrTiO3超晶格中原子扩散的演化及其相应效应
DOI:
10.1007/s10854-021-06657-0
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发表时间:
2021-07
期刊:
影响因子:
--
通讯作者:
Bangmin Zhang
中科院分区:
文献类型:
--
作者:
Bangmin Zhang
The cation order/disorder is an effective freedom to control manganite properties, and superlattice configuration could be used to design artificial configurations with cation ordering. In this work, [(La0.7Sr0.3MnO3)1/(SrTiO3)1]100 superlattices were fabricated on (001) SrTiO3 and (001) (LaAlO3)0.3–(Sr2AlTaO6)0.7 substrate with different in-plane strain statuses. Detailed study on local structure indicates that around the superlattice/substrate range, the film configuration is different with the designed configuration with intensive atomic interdiffusion; with the increase of film thickness to the sample surface, the designed superlattice configurations appears for superlattice on SrTiO3 substrate. For superlattice on (LaAlO3)0.3–(Sr2AlTaO6)0.7 substrate, the sample configuration shows similar trend. The lattice-mismatch-induced structural distortion is proposed to affect energy barrier of atomic diffusion and the atomic vibration frequency, which then control the degree of the atomic interdiffusion and corresponding magnetic properties. This work shows that the not only the local crystal structure but also the atomic arrangement in superlattice are important to design materials.
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