Evidence for Interfacial Octahedral Coupling as a Route to Enhance Magnetoresistance in Perovskite Oxide Superlattices

Yu Zhou; Summayya Kouser; Albina Y. Borisevich; Sokrates T. Pantelides; Steven J. May

doi:10.1002/admi.201901576

Evidence for Interfacial Octahedral Coupling as a Route to Enhance Magnetoresistance in Perovskite Oxide Superlattices

Yu Zhou, Summayya Kouser, Albina Y. Borisevich, Sokrates T. Pantelides, Steven J. May

electron Microscopy and Microanalysis

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12 Scopus citations

Abstract

Engineering octahedral rotations in oxide heterostructures is a promising route for controlling magnetic properties in perovskites, with recent work focusing on magnetic-ordering temperatures and magnetic anisotropies. Here the effects of interfacial octahedral coupling on magnetoresistance are demonstrated in a series of (La_0.7Sr_0.3MnO₃)_n/(LaFeO₃)₁₀ superlattices grown on (001)- and (111)-oriented SrTiO₃ substrates. The different crystallographic orientations allow for the interfacial octahedral connectivity to be tuned, with weaker interfacial coupling present at the (001)-oriented than the (111)-oriented structures as revealed by density functional theory calculations. In n = 14 superlattices, the effect of orientation on the physical properties is minimal with both (001)- and (111)-oriented samples exhibiting similar magnetoresistance. As the fraction of interfacial volume within the LSMO layers is increased by decreasing n, the magnetoresistive behavior of the samples diverges with significantly larger magnetoresistance magnitudes present in the (111)-oriented superlattices. The results are consistent with octahedral coupling playing a greater role in the functional properties at (111)-heterointerfaces and demonstrate a structure-driven approach to tuning interfacial magnetoresistance in complex-oxide heterostructures.

Original language	English
Article number	1901576
Journal	Advanced Materials Interfaces
Volume	7
Issue number	9
DOIs	https://doi.org/10.1002/admi.201901576
State	Published - May 1 2020

Funding

Y.Z. was supported by the China Scholarship Council (CSC). Materials synthesis at Drexel utilized deposition instrumentation acquired through an Army Research Office DURIP grant (W911NF-14-1-0493). S.K. and S.T.P. were supported by Department of Energy Grant DE-FG02-09ER46554 and the McMinn Endowment at Vanderbilt University. S.K. and S.T.P. also acknowledge the National Energy Research Scientific Computing Center, a DOE office of Science user facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 for providing computer time. Electron microscopy work (A.Y.B.) was supported by the U.S. Department of Energy (DOE) Office of Science, Office of Basic Energy Sciences (BES), Materials Science and Engineering Division.

Keywords

magnetism
magnetoresistance
manganites
octahedral rotations
oxide interfaces, perovskites

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title = "Evidence for Interfacial Octahedral Coupling as a Route to Enhance Magnetoresistance in Perovskite Oxide Superlattices",

abstract = "Engineering octahedral rotations in oxide heterostructures is a promising route for controlling magnetic properties in perovskites, with recent work focusing on magnetic-ordering temperatures and magnetic anisotropies. Here the effects of interfacial octahedral coupling on magnetoresistance are demonstrated in a series of (La0.7Sr0.3MnO3)n/(LaFeO3)10 superlattices grown on (001)- and (111)-oriented SrTiO3 substrates. The different crystallographic orientations allow for the interfacial octahedral connectivity to be tuned, with weaker interfacial coupling present at the (001)-oriented than the (111)-oriented structures as revealed by density functional theory calculations. In n = 14 superlattices, the effect of orientation on the physical properties is minimal with both (001)- and (111)-oriented samples exhibiting similar magnetoresistance. As the fraction of interfacial volume within the LSMO layers is increased by decreasing n, the magnetoresistive behavior of the samples diverges with significantly larger magnetoresistance magnitudes present in the (111)-oriented superlattices. The results are consistent with octahedral coupling playing a greater role in the functional properties at (111)-heterointerfaces and demonstrate a structure-driven approach to tuning interfacial magnetoresistance in complex-oxide heterostructures.",

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author = "Yu Zhou and Summayya Kouser and Borisevich, {Albina Y.} and Pantelides, {Sokrates T.} and May, {Steven J.}",

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AU - Pantelides, Sokrates T.

AU - May, Steven J.

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AB - Engineering octahedral rotations in oxide heterostructures is a promising route for controlling magnetic properties in perovskites, with recent work focusing on magnetic-ordering temperatures and magnetic anisotropies. Here the effects of interfacial octahedral coupling on magnetoresistance are demonstrated in a series of (La0.7Sr0.3MnO3)n/(LaFeO3)10 superlattices grown on (001)- and (111)-oriented SrTiO3 substrates. The different crystallographic orientations allow for the interfacial octahedral connectivity to be tuned, with weaker interfacial coupling present at the (001)-oriented than the (111)-oriented structures as revealed by density functional theory calculations. In n = 14 superlattices, the effect of orientation on the physical properties is minimal with both (001)- and (111)-oriented samples exhibiting similar magnetoresistance. As the fraction of interfacial volume within the LSMO layers is increased by decreasing n, the magnetoresistive behavior of the samples diverges with significantly larger magnetoresistance magnitudes present in the (111)-oriented superlattices. The results are consistent with octahedral coupling playing a greater role in the functional properties at (111)-heterointerfaces and demonstrate a structure-driven approach to tuning interfacial magnetoresistance in complex-oxide heterostructures.

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Evidence for Interfacial Octahedral Coupling as a Route to Enhance Magnetoresistance in Perovskite Oxide Superlattices

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