Control of octahedral rotations via octahedral connectivity in an epitaxially strained [1 u.c.//4 u.c.] LaNiO3/LaGaO3 superlattice

Qi, Haoyuan; Kinyanjui, Michael Kiarie; Chen, Xiaodan; Biskupek, Johannes; Geiger, Dorin; Benckiser, E.; Habermeier, H.‐U.; Keimer, B.; Kaiser, Ute

doi:10.1007/s10853-016-0092-4

Cited by 4 publications

(1 citation statement)

References 47 publications

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“…[ 4–7 ] These alterations result in an interfacial region typically of order 2–10 unit cells in which the octahedral rotations are suppressed, enhanced, or even take on different patterns than found in either of the adjoined materials. [ 8–13 ] As the orbital hybridization between the B‐site‐derived d states and O 2p states is linked to the BOB bond angles and lengths, the electronic, magnetic, and optical functionality at perovskite interfaces is highly sensitive to the structural distortions. In magnetic oxide heterostructures, interfacial octahedral coupling has been shown to directly influence local magnetization, [ 14–19 ] ordering temperatures, [ 20,21 ] and magnetocrystalline anisotropy.…”

Section: Introductionmentioning

confidence: 99%

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

Kouser

Borisevich

et al. 2020

Adv Materials Inter

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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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