Magnetism in iridate heterostructures leveraged by structural distortions

Meyers, D.; Cao, Yue; Fabbris, G.; Robinson, Neil J.; Hao, Lin; Frederick, C.; Traynor, N.; Yang, J.; Lin, Jiaqi; Upton, M. H.; Casa, D.; Kim, Jong-Woo; Gog, T.; Karapetrova, E.; Choi, Yongseong; Haskel, D.; Ryan, P. J.; Horak, Lukas; Liu, X.; Liu, Jian; Dean, M. P. M.

doi:10.1038/s41598-019-39422-9

Title: Magnetism in iridate heterostructures leveraged by structural distortions

Journal Article · Tue Mar 12 00:00:00 EDT 2019 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-019-39422-9· OSTI ID:1619503

Meyers, D.; Cao, Yue; Fabbris, G.; Robinson, Neil J.;

; Frederick, C.; Traynor, N.; Yang, J.; Lin, Jiaqi;

; Casa, D.; Kim, Jong-Woo; Gog, T.; Karapetrova, E.; Choi, Yongseong; Haskel, D.; Ryan, P. J.; Horak, Lukas; Liu, X.;

Fundamental control of magnetic coupling through heterostructure morphology is a prerequisite for rational engineering of magnetic ground states. We report the tuning of magnetic interactions in superlattices composed of single and bilayers of SrIrO3 inter-spaced with SrTiO3 in analogy to the Ruddlesden-Popper series iridates. Magnetic scattering shows predominately c-axis antiferromagnetic orientation of the magnetic moments for the bilayer, as in Sr3Ir2O7. However, the magnetic excitation gap, measured by resonant inelastic x-ray scattering, is quite different between the two structures, evidencing a significant change in the stability of the competing magnetic phases. In contrast, the single layer iridate hosts a more bulk-like gap. We find these changes are driven by bending of the caxis Ir-O-Ir bond, which is much weaker in the single layer, and subsequent local environment changes, evidenced through x-ray diffraction and magnetic excitation modeling. Our findings demonstrate how large changes in the magnetic interactions can be tailored and probed in spin-orbit coupled heterostructures by engineering subtle structural modulations.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Tennessee, Knoxville, TN (United States); Chinese Academy of Sciences (CAS), Beijing (China)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Defense Advanced Research Projects Agency (DARPA) (United States); Ministry of Science and Technology (MOST) (China); Chinese Academy of Sciences (CAS) (China)

Grant/Contract Number:: SC0012704; 1047478; AC02- 06CH11357; AC02-06CH11357; HR0011-16-1-0005; 2015CB921302; XDB07020200

OSTI ID:: 1619503

Alternate ID(s):: OSTI ID: 1501560; OSTI ID: 1515548

Report Number(s):: BNL-211401-2019-JAAM; 4263; PII: 39422

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Vol. 9 Journal Issue: 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 21 works

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