Impurity-induced moment freezing in NaFe$_x$Ru$_{1-x}$O$_2$
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912232215937024 |
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| author | Avidor, Alon Hendler Ortiz, Brenden R. Sarte, Paul M. Zhang, Qiang Wilson, Stephen D. |
| author_facet | Avidor, Alon Hendler Ortiz, Brenden R. Sarte, Paul M. Zhang, Qiang Wilson, Stephen D. |
| contents | We report the impact of magnetic impurity substitution on the quantum disordered magnetic ground state of NaRuO$_2$. Local $S=5/2$ moments are introduced into the frustrated triangular lattice of $J_{eff}=1/2$ Ru moments via Fe-substitution in NaFe$_x$Ru$_{1-x}$O$_2$, 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 NaRuO$_2$. 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 NaRuO$_2$ that are pinned by local magnetic impurities, similar to ``swiss cheese" models of impurity-substituted copper oxides. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_10343 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Impurity-induced moment freezing in NaFe$_x$Ru$_{1-x}$O$_2$ Avidor, Alon Hendler Ortiz, Brenden R. Sarte, Paul M. Zhang, Qiang Wilson, Stephen D. Strongly Correlated Electrons Materials Science We report the impact of magnetic impurity substitution on the quantum disordered magnetic ground state of NaRuO$_2$. Local $S=5/2$ moments are introduced into the frustrated triangular lattice of $J_{eff}=1/2$ Ru moments via Fe-substitution in NaFe$_x$Ru$_{1-x}$O$_2$, 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 NaRuO$_2$. 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 NaRuO$_2$ that are pinned by local magnetic impurities, similar to ``swiss cheese" models of impurity-substituted copper oxides. |
| title | Impurity-induced moment freezing in NaFe$_x$Ru$_{1-x}$O$_2$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2502.10343 |