Local magnetism and spin correlations in the geometrically frustrated cluster magnet LiZn${}_2$Mo${}_3$O${}_8$

Abstract

LiZn${}_2$Mo${}_3$O${}_8$ has been proposed to contain $S=1/2$ Mo${}_3$O${}_{13}$ magnetic clusters arranged on a triangular lattice with antiferromagnetic nearest-neighbor interactions. Here, microwave and terahertz electron spin resonance (ESR), ${}^7$Li nuclear magnetic resonance (NMR), and muon spin rotation ($\mu \text{SR}$) spectroscopies are used to characterize the local magnetic properties of LiZn${}_2$Mo${}_3$O${}_8$. These results show the magnetism in LiZn${}_2$Mo${}_3$O${}_8$ arises from a single isotropic $S=1/2$ electron per cluster and that there is no static long-range magnetic ordering down to $T=0.07\text{K}$. Further, there is evidence of gapless spin excitations with spin fluctuations slowing down as the temperature is lowered. These data indicate strong spin correlations which, together with previous data, suggest a low-temperature resonating valence-bond state in LiZn${}_2$Mo${}_3$O${}_8$.

18 pages, 5 figures

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• Magnetically driven superconductivity in CeCu2Si2
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