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원자제어 저차원 전자계 연구단
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Sr2IrO4/Sr3Ir2 O7 superlattice for a model two-dimensional quantum Heisenberg antiferromagnet

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Title
Sr2IrO4/Sr3Ir2 O7 superlattice for a model two-dimensional quantum Heisenberg antiferromagnet
Author(s)
Hoon Kim; Bertinshaw, Joel; Porras, J.; Keimer, B.; Kim, Jungho; Kim, J.-W.; Jimin Kim; Jonghwan Kim; Noh, Gahee; Kim, Gi-Yeop; Choi, Si-Young; B.J. Kim
Publication Date
2022-03
Journal
Physical Review Research, v.4, no.1
Publisher
American Physical Society
Abstract
Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.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 (n=1) and the double (n=2) layer members of the Ruddlesden-Popper series iridates Srn+1IrnO3n+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.
URI
https://pr.ibs.re.kr/handle/8788114/11983
DOI
10.1103/PhysRevResearch.4.013229
ISSN
2643-1564
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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