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Ferromagnetic phase transition and single-gap type electrical conductivity of epitaxial LaMnO3/LaAlO3 superlattices

: Wei, H.; Yang, C.; Barzola-Quiquia, J.L.; Welke, M.; Denecke, R.; Patzig, C.; Höche, T.; Esquinazi, P.; Grundmann, M.; Lorenz, M.


Journal of Physics. D. Applied Physics 50 (2017), No.43, Art. 43LT02, 7 pp.
ISSN: 0022-3727
ISSN: 1361-6463
Journal Article
Fraunhofer IMWS ()

High-quality epitaxial LaMnO3/LaAlO3 superlattices (SLs) with (0 0 1), (0 1 1), and (1 1 1) out-of-plane orientation were grown by pulsed laser deposition. This SL material was predicted theoretically as a Chern insulator for realizing the quantum anomalous Hall effect. In our investigations, a paramagnetic-ferromagnetic phase transition is found with decreasing temperature around 100 K, indicating a controllable ferroic order at low temperatures. Electrical transport measurements reveal a thermally activated single-gap behavior with a fitted band gap of 436 meV for the (1 1 1)-oriented SL. With that, the results prove the predictions of a ferromagnetic background in the SLs, and of a gapped band structure.