Interfacial coupling and polarization of ABO3 heterostructures

Lijun Wu; Zhen Wang; Bangmin Zhang; Liping Yu; G. M. Chow; Jing Tao; Myung-Geun Han; Hangwen Guo; Lina Chen; E. W. Plummer; Jiandi Zhang; Yimei Zhu

doi:10.1117/12.2269475

28 February 2017 Interfacial coupling and polarization of perovskite ABO₃ heterostructures

Lijun Wu, Zhen Wang, Bangmin Zhang, Liping Yu, G. M. Chow, Jing Tao, Myung-Geun Han, Hangwen Guo, Lina Chen, E. W. Plummer, Jiandi Zhang, Yimei Zhu

Author Affiliations +

Proceedings Volume 10105, Oxide-based Materials and Devices VIII; 1010518 (2017) https://doi.org/10.1117/12.2269475
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

Interfaces with subtle difference in atomic and electronic structures in perovskite ABO₃ heterostructures often yield intriguingly different properties, yet their exact roles remain elusive. In this article, we report an integrated study of unusual transport, magnetic, and structural properties of Pr_0.67Sr_0.33MnO₃ (PSMO) films and La_0.67Sr_0.33MnO₃ (LSMO) films of various thicknesses on SrTiO₃ (STO) substrate. In particular, using atomically resolved imaging and electron energy-loss spectroscopy (EELS), we measured interface related local lattice distortion, BO₆ octahedral rotation and cation-anion displacement induced polarization. In the very thin PSMO film, an unexpected interface-induced ferromagnetic polaronic insulator phase was observed during the cubic-to-tetragonal phase transition of the substrate STO, due to the enhanced electron-phonon interaction and atomic disorder in the film. On the other hand, for the very thin LSMO films we observed a remarkably deep polarization in non-ferroelectric STO substrate near the interface. Combining the experimental results with first principles calculations, we propose that the observed deep polarization is induced by an electric field originating from oxygen vacancies that extend beyond a dozen unit-cells from the interface, thus providing important evidence of the role of defects in the emergent interface properties of transition metal oxides.

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Lijun Wu, Zhen Wang, Bangmin Zhang, Liping Yu, G. M. Chow, Jing Tao, Myung-Geun Han, Hangwen Guo, Lina Chen, E. W. Plummer, Jiandi Zhang, and Yimei Zhu "Interfacial coupling and polarization of perovskite ABO₃ heterostructures", Proc. SPIE 10105, Oxide-based Materials and Devices VIII, 1010518 (28 February 2017); https://doi.org/10.1117/12.2269475

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KEYWORDS

Interfaces

Oxygen

Polarization

Manganese

Strontium

Fermium

Frequency modulation

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