The decisive role of magnetic anisotropy in honeycomb layered Li${}_3$Ni${}_2$SbO${}_6$ and Na${}_3$Ni${}_2$SbO${}_6$

Abstract

The decisive role of magnetic anisotropy even in systems with small anisotropy is illustrated for the honeycomb-layered antiferromagnets The decisive role of magnetic anisotropy in honeycomb layered Li${}_3$Ni${}_2$SbO${}_6$ and Na${}_3$Ni${}_2$SbO${}_6$ with $A$ = Li and Na. Both systems evolve long range magnetic order below $T_{\mathrm{N}}$ = 14 and 16.5~K, respectively. The magnetic phase diagrams obtained from static magnetisation studies up to 15~T imply competing antiferromagnetic phases and a tricritical point at $T_{\mathrm{N}}$. The phase boundaries are visible in the dynamic response of the antiferromagnetic resonance modes, too, which investigation by means of high frequency/high field electron spin resonance enables precise determination of magnetic anisotropy. The anisotropy gap amounts to $\Delta =360\pm 2$~GHz in Na${}_3$Ni${}_2$SbO${}_6$ while in Li${}_3$Ni${}_2$SbO${}_6$ orthorhombicity is associated with $\Delta =198\pm 4$ and $218\pm 4$~GHz. Above $T_{\mathrm{N}}$, the data imply short-range antiferromagnetic order up to at least 80~K. The data suggest a crucial role of anisotropy for selecting the actual spin structure at $B=0$~T.

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Cited by in corpus (5)

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• Advances in honeycomb layered oxides: Part I -- Syntheses and Characterisations of Pnictogen- and Chalcogen-Based Honeycomb Layered Oxides
• Magnetism and field-induced effects in the S = 5/2 honeycomb lattice antiferromagnet FeP3SiO11
• Spin waves in Na${}_2$Co${}_2$TeO${}_6$ studied by high-frequency/high-field ESR: Successes and failures of the triple-$\mathbf{q}$ model