2013/12/03 by J. P. Sheckelton, F. R. Foronda, LiDong Pan +8 · 1 citation
Physics and Astronomy · #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.89.064407
published as Phys. Rev. B 89, 064407 (2014) · 18 pages, 5 figures
arxiv created 2013/12/03 · arxiv updated 2016/08/11
LiZn2Mo3O8 has been proposed to contain S~=~1/2 Mo3O13 magnetic clusters arranged on a triangular lattice with antiferromagnetic nearest-neighbor interactions. Here, microwave and terahertz electron spin resonance (ESR), 7Li nuclear magnetic resonance (NMR), and muon spin rotation (μ\textrmSR) spectroscopies are used to characterize the local magnetic properties of LiZn2Mo3O8. These results show the magnetism in LiZn2Mo3O8 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 \textrmK. 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 LiZn2Mo3O8.