Local magnetism and spin correlations in the geometrically frustrated cluster magnet LiZn2Mo3O8
Local magnetism and spin correlations in the geometrically frustrated cluster magnet LiZn2Mo3O8
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DOI：
10.1103/physrevb.89.064407
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发表时间：
2014-02-11
影响因子：
3.7
通讯作者：
McQueen, T. M.
中科院分区：
文献类型：
--
作者：
Sheckelton, J. P.;Foronda, F. R.;McQueen, T. M.
LiZn2Mo3O8 已被提议包含排列在具有反铁磁最近邻相互作用的三角形晶格上的 S = 1/2 Mo3O13 磁簇。这里，利用微波和太赫兹电子自旋共振、Li-7核磁共振和μ子自旋旋转光谱来表征LiZn2Mo3O8的局域磁特性。这些结果表明，LiZn2Mo3O8 中的磁性源自每个簇中单个各向同性 S = 1/2 电子，并且在低至 T = 0.07 K 的情况下不存在静态长程磁有序。此外，有证据表明无间隙自旋激发，自旋波动随着温度降低而减慢。这些数据表明强烈的自旋相关性，与之前的数据一起表明 LiZn2Mo3O8 中存在低温共振价键态。
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, Li-7 nuclear magnetic resonance, and muon spin rotation 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 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 LiZn2Mo3O8.