Magnetic ordering in the $J_{\rm eff}$ = 0 Nickelate NiRh$_2$O$_4$ prepared via a solid-state metathesis
| Autor: | Haraguchi, Yuya, Nishio-Hamane, Daisuke, Katori, Hiroko Aruga |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Physical Review Materials, 7, 084413 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevMaterials.7.084413 |
| Popis: | In spinel-type nickelate NiRh$_2$O$_4$, magnetic ordering is observed upon the sample synthesized via kinetically controlled low-temperature solid-state metathesis, as opposed to previously-reported samples obtained through conventional solid-state reaction. Our findings are based on a combination of bulk susceptibility and specific heat measurements that disclose a N$\'e$el transition temperature of $T_N$ = 45 K in this material, which might feature spin-orbit entanglement in the tetragonally-coordinated $d^8$ Mott insulators. The emergence of magnetic ordering upon alteration of the synthesis route indicates that the suppression of magnetic ordering in the previous sample was rooted in the cation-mixing assisted by the entropy gain that results from high-temperature reactions. Furthermore, the $J_{\rm eff}$ = 0 physics, instead of solely the spin-only $S = 1$, describes the observed enhancement of effective magnetic moment well. Overseeing all observations and speculations, we propose that the possible mechanism responsible for the emergent magnetic orderings in NiRh$_2$O$_4$ is the condensation of $J_{\rm eff}$ = 0 exciton, driven by the interplay of the tetragonal crystal field and superexchange interactions. Comment: 7 pages, 5 figures, accepted in Physical Review Materials |
| Databáze: | arXiv |
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