溅射生长在SrTiO3上的La0.7Sr0.3MnO3−δ薄膜的持续相干外延及氧空位的作用

IF 0.9 4区物理与天体物理 Q4 PHYSICS, APPLIED

European Physical Journal-applied Physics Pub Date : 2021-06-01 DOI:10.1051/EPJAP/2021200365

M. Lmouchter, M. Suzuki

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引用次数: 1

摘要

采用轴向射频磁控溅射技术在SrTiO3(100)衬底上生长出表面光滑的La0.7 Sr0.3 MnO3−δ (LSMO)单晶外延薄膜。我们发现180nm厚薄膜经过热处理后的电阻率和自发磁化强度几乎等于单晶。另一方面，居里温度T C不高于270 K，远低于本体温度，这是非常不寻常的。作为这个谜题的线索，我们注意到在LSMO(一种氧非化学计量氧化物)的情况下，这些薄膜的晶格常数与氧空位的数量之间存在很强的相关性。由此，我们得出结论，通过加入有限数量的氧空位，可以实现持续的相干外延，以匹配0.8%的晶格失配，从而放松薄膜的面内应力，同时显着降低tc。

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Sustained coherent epitaxy and role of oxygen vacancies in La0.7Sr0.3MnO3−δ thin films grown on SrTiO3 by sputtering

Ferromagnetic La0.7 Sr0.3 MnO3−δ (LSMO) epitaxial thin films of single-crystal quality with very smooth surfaces are grown on SrTiO3 (100) substrates by on-axis rf magnetron sputtering. We find that the resistivity and the spontaneous magnetization for these 180 nm thick films are nearly equal to those of single crystals after thermal annealing. On the other hand, the Curie temperature T C is no higher than 270 K, a value far below the bulk one, which is quite unusual. As a clue to this riddle, we note a strong correlation between the lattice constant for these films and the amount of oxygen vacancies in the case of LSMO, an oxygen-nonstoichiometric oxide. From this, we conclude that the sustained coherent epitaxy takes place to match the lattice mismatch of 0.8% by incorporating a limited amount of oxygen vacancies, which relaxes the film in-plane stress while functions to significantly reduce T C .

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来源期刊

European Physical Journal-applied Physics 物理-物理：应用

CiteScore

1.90

自引率

10.00%

发文量

审稿时长

1.9 months

期刊介绍： EPJ AP an international journal devoted to the promotion of the recent progresses in all fields of applied physics. The articles published in EPJ AP span the whole spectrum of applied physics research.