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Proceedings Paper

Interfacial coupling and polarization of ABO3 heterostructures
Author(s): 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
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Paper 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 Pr0.67Sr0.33MnO3 (PSMO) films and La0.67Sr0.33MnO3 (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.

Paper Details

Date Published: 28 February 2017
PDF: 7 pages
Proc. SPIE 10105, Oxide-based Materials and Devices VIII, 1010518 (28 February 2017); doi: 10.1117/12.2269475
Show Author Affiliations
Lijun Wu, Brookhaven National Lab. (United States)
Zhen Wang, Brookhaven National Lab. (United States)
Louisiana State Univ. (United States)
Bangmin Zhang, National Univ. of Singapore (Singapore)
Liping Yu, Temple Univ. (United States)
G. M. Chow, National Univ. of Singapore (Singapore)
Jing Tao, Brookhaven National Lab. (United States)
Myung-Geun Han, Brookhaven National Lab. (United States)
Hangwen Guo, Louisiana State Univ. (United States)
Lina Chen, Louisiana State Univ. (United States)
E. W. Plummer, Louisiana State Univ. (United States)
Jiandi Zhang, Louisiana State Univ. (United States)
Yimei Zhu, Brookhaven National Lab. (United States)

Published in SPIE Proceedings Vol. 10105:
Oxide-based Materials and Devices VIII
Ferechteh H. Teherani; David C. Look; David J. Rogers, Editor(s)

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