Experimental observation of decoupled spin subsystems in decorated square kagomé lattice magnets of the nabokoite family
Abstract
The square kagomé lattice (SKL) offers a model platform for investigating geometric frustration in 2D systems. Nabokoite-family compounds \nabok{A}{X} (A=Na, K, Cs, Rb and X=Cl, Br) extend this physics to a 3D network, where 2D SKL layers are decorated by interlayer spins. Using electron paramagnetic resonance (EPR), we demonstrate a dramatic splitting of this complex exchange network into two virtually decoupled spin subsystems: absolute calibration of the electron paramagnetic resonance (EPR) absorption reveals that only a fraction of all copper spins in nabokoites is EPR-active and this fraction of the spins orders at the Néel point. Comparison of the EPR absorption and static susceptibility indicates that contribution of the EPR-silent spin subsystem to total magnetic susceptibility decreases on cooling. This direct observation of coexisting magnetic order and possible spin-liquid dynamics within a single compound challenges conventional models of unified exchange networks in decorated frustrated lattices.
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BibTeX
@misc{glazkov2026experimental,
title = {{Experimental observation of decoupled spin subsystems in decorated square kagomé lattice magnets of the nabokoite family}},
author = {V. N. Glazkov and Ya V. Rebrov and M. A. Dubovitskii and M. M. Markina and A. F. Murtazoev and P. S. Berdonosov and A. N. Vasiliev},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.29323},
eprint = {2608.29323},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.29323},
}
RIS
TY - UNPB
TI - Experimental observation of decoupled spin subsystems in decorated square kagomé lattice magnets of the nabokoite family
AU - V. N. Glazkov
AU - Ya V. Rebrov
AU - M. A. Dubovitskii
AU - M. M. Markina
AU - A. F. Murtazoev
AU - P. S. Berdonosov
AU - A. N. Vasiliev
PY - 2026
DA - 2026/08/29
PB - arXiv
DO - 10.48550/arxiv.2608.29323
UR - https://arxiv.org/abs/2608.29323
AB - The square kagomé lattice (SKL) offers a model platform for investigating geometric frustration in 2D systems. Nabokoite-family compounds \nabok{A}{X} (A=Na, K, Cs, Rb and X=Cl, Br) extend this physics to a 3D network, where 2D SKL layers are decorated by interlayer spins. Using electron paramagnetic resonance (EPR), we demonstrate a dramatic splitting of this complex exchange network into two virtually decoupled spin subsystems: absolute calibration of the electron paramagnetic resonance (EPR) absorption reveals that only a fraction of all copper spins in nabokoites is EPR-active and this fraction of the spins orders at the Néel point. Comparison of the EPR absorption and static susceptibility indicates that contribution of the EPR-silent spin subsystem to total magnetic susceptibility decreases on cooling. This direct observation of coexisting magnetic order and possible spin-liquid dynamics within a single compound challenges conventional models of unified exchange networks in decorated frustrated lattices.
ER -