We report the impact of magnetic impurity substitution on the quantum disordered magnetic ground state of NaRuO2. Local S=5/2 moments are introduced into the frustrated triangular lattice of Jeff=1/2 Ru moments via Fe-substitution in NaFexRu1−xO2, and the evolution of the magnetic ground state is reported. Local spin freezing associated with conventional spin glass behavior is observed upon Fe substitution, marking an impurity-induced freezing of the primarily dynamic magnetic ground state in NaRuO2. Furthermore, local Fe moments induce a Curie-Weiss magnetic behavior in the uniform magnetic susceptibility, and the local moment magnitude is best described by dynamic Ru moments polarized about impurity sites. Our results establish an impurity-doping phenomenology consistent with inherently dynamic moments in NaRuO2 that are pinned by local magnetic impurities, similar to ``swiss cheese" models of impurity-substituted copper oxides.
@article{arxiv.2502.10343,
title = {Impurity-induced moment freezing in NaFe$_x$Ru$_{1-x}$O$_2$},
author = {Alon Hendler Avidor and Brenden R. Ortiz and Paul M. Sarte and Qiang Zhang and Stephen D. Wilson},
journal= {arXiv preprint arXiv:2502.10343},
year = {2025}
}