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Evidence for Interfacial Octahedral Coupling as a Route to Enhance Magnetoresistance in Perovskite Oxide Superlattices
Author(s) -
Zhou Yu,
Kouser Summayya,
Borisevich Albina Y.,
Pantelides Sokrates T.,
May Steven J.
Publication year - 2020
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201901576
Subject(s) - superlattice , magnetoresistance , materials science , heterojunction , condensed matter physics , octahedron , density functional theory , oxide , perovskite (structure) , coupling (piping) , crystallography , chemical physics , crystal structure , magnetic field , computational chemistry , optoelectronics , composite material , metallurgy , chemistry , physics , quantum mechanics
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 0.7 Sr 0.3 MnO 3 ) n /(LaFeO 3 ) 10 superlattices grown on (001)‐ and (111)‐oriented SrTiO 3 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.