Sr 2 IrO 4 / Sr 3 Ir 2 O 7 superlattice for a model two-dimensional quantum Heisenberg antiferromagnet

Kim, Hoon; Bertinshaw, Joel; Porras, J.; Keimer, B.; Kim, Jungho; Kim, J. -W.; Kim, Jimin; Kim, Jonghwan; Noh, Gahee; Kim, Gi-Yeop; Choi, Si-Young; Kim, B. J.

doi:10.1103/PhysRevResearch.4.013229

Title: ${Sr}_{2} {IrO}_{4} / {Sr}_{3} {Ir}_{2} O_{7}$ superlattice for a model two-dimensional quantum Heisenberg antiferromagnet

Journal Article · Mon Mar 28 00:00:00 EDT 2022 · Physical Review Research

DOI:https://doi.org/10.1103/PhysRevResearch.4.013229· OSTI ID:1859809

; Bertinshaw, Joel; Porras, J.; Keimer, B.;

;

; Kim, Jonghwan; Noh, Gahee; Kim, Gi-Yeop; Choi, Si-Young; Kim, B. J.

Spin-orbit entangled pseudospins hold promise for a wide array of exotic magnetism ranging from a Heisenberg antiferromagnet to a Kitaev spin liquid depending on the lattice and bonding geometry, but many of the host materials suffer from lattice distortions and deviate from idealized models in part due to inherent strong pseudospin-lattice coupling. Here, we report on the synthesis of a magnetic superlattice comprising the single ($$\textit{n}$$ = 1) and the double $$\textit{n}$$ = 2) layer members of the Ruddlesden-Popper series iridates Sr_n+1Ir_nO_3n+1 alternating along the c-axis, and provide a comprehensive study of its lattice and magnetic structures using scanning transmission electron microscopy, resonant elastic and inelastic x-ray scattering, third harmonic generation measurements and Raman spectroscopy. The superlattice is free of the structural distortions reported for the parent phases and has a higher point group symmetry, while preserving the magnetic orders and pseudospin dynamics inherited from the parent phases, featuring two magnetic transitions with two symmetry-distinct orders. We infer weaker pseudospin-lattice coupling from the analysis of Raman spectra and attribute it to frustrated magnetic-elastic couplings. Thus, the superlattice expresses a near ideal network of effective spin-one-half moments on a square lattice.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: USDOE Office of Science (SC); National Research Foundation of Korea (NRF); Institute for Basic Science (IBS); European Research Council (ERC); Alexander von Humboldt Foundation

Grant/Contract Number:: AC02-06CH11357; 669550; 2013M3A6B1078872

OSTI ID:: 1859809

Alternate ID(s):: OSTI ID: 1879099

Journal Information:: Physical Review Research, Journal Name: Physical Review Research Vol. 4 Journal Issue: 1; ISSN 2643-1564

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: ${Sr}_{2} {IrO}_{4} / {Sr}_{3} {Ir}_{2} O_{7}$ superlattice for a model two-dimensional quantum Heisenberg antiferromagnet