Liquid-like spin dynamics in a hybrid Heisenberg-Ising antiferromagnet

Jin-Kwang Kim, Hoon Kim, Junyoung Kwon, Hyun-Woo J. Kim, Kwangrae Kim, Seung-Hyeok Ha, Jaehwon Kim, Hyun-Sung Kim, Jimin Kim, Gahee Noh, Gi-Yeop Kim, Si-Young Choi, Jaeku Park, Intae Eom, Dogeun Jang, Sae Hwan Chun, Ayman Said, XianRong Huang, Jungho Kim and B. J. Kim ()
Additional contact information
Jin-Kwang Kim: Pohang University of Science and Technology
Hoon Kim: Pohang University of Science and Technology
Junyoung Kwon: Pohang University of Science and Technology
Hyun-Woo J. Kim: Pohang University of Science and Technology
Kwangrae Kim: Pohang University of Science and Technology
Seung-Hyeok Ha: Pohang University of Science and Technology
Jaehwon Kim: Pohang University of Science and Technology
Hyun-Sung Kim: Pohang University of Science and Technology
Jimin Kim: Institute for Basic Science (IBS)
Gahee Noh: Pohang University of Science and Technology
Gi-Yeop Kim: Pohang University of Science and Technology
Si-Young Choi: Pohang University of Science and Technology
Jaeku Park: POSTECH
Intae Eom: POSTECH
Dogeun Jang: POSTECH
Sae Hwan Chun: POSTECH
Ayman Said: Argonne National Laboratory
XianRong Huang: Argonne National Laboratory
Jungho Kim: Argonne National Laboratory
B. J. Kim: Pohang University of Science and Technology

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract Two-dimensional (2D) materials and their heterostructures enable unconventional electronic properties and functionalities not accessible in their bulk counterparts. This approach is now being extended to magnetic materials to engineer their spin structures and magnetic fields produced by them. However, spin dynamics of 2D magnetic heterostructures remain largely unexplored. Here, we demonstrate that heterointerfacing Heisenberg square-lattice antiferromagnet (AF) Sr2IrO4 with its bilayer variant Ising AF Sr3Ir2O7 in a superlattice leads to liquid-like spin dynamics in the former, characterized by slow recovery of the AF order after its transient suppression by an optical pump, and complete absence of spin waves except in an immediate vicinity of the ordering wavevector. Instead, the spin excitation spectra are dominated by isotropic continua, which in previous works have been interpreted as fractional spin excitations, or spinons, that extends to unprecedentedly low energies. Thus, our results provide a pathway to frustrated magnetism in square lattices by heterointerfacing two distinct types of AFs.

Date: 2025
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DOI: 10.1038/s41467-025-56635-x

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