Quantum spin liquid in the spin-1/2 triangular antiferromagnet EtMe3Sb[Pd(dmit)2]2
Quantum spin liquid in the spin-1/2 triangular antiferromagnet EtMe3Sb[Pd(dmit)2]2
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DOI：
10.1103/physrevb.77.104413
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发表时间：
2008-03-01
影响因子：
3.7
通讯作者：
Kato, R.
中科院分区：
文献类型：
--
作者：
Itou, T.;Oyamada, A.;Kato, R.
层状有机盐家族X [Pd(dmit)(2)](2)是莫特绝缘体，形成斜角三角形自旋1/2体系。其中，EtMe3Sb[Pd(dmit)(2)](2)具有近正三角晶格。我们用c -13核磁共振和静态磁化率测量研究了这种盐的自旋态。磁化率的温度依赖性描述为正则三角形反铁磁自旋-1 / 2体系，交换相互作用J=220 ~ 250 K。C-13-NMR测量结果表明，该体系在1.37 K（小于j的1%）以下没有自旋有序/冻结的迹象，也没有明显的自旋间隙，这一结果强烈表明该体系处于量子自旋-液体状态，没有明显的自旋间隙，这是长期以来所追求的。
The family of layered organic salts X [Pd(dmit)(2)](2) are Mott insulators and form scalene-triangular spin-1/2 systems. Among them, EtMe3Sb[Pd(dmit)(2)](2) has a nearly regular- triangular lattice. We have investigated the spin state of this salt by C-13-NMR and static susceptibility measurements. The temperature dependence of the susceptibility is described as that of a regular-triangular antiferromagnetic spin-1 / 2 system with an exchange interaction J=220-250 K. The C-13-NMR measurements reveal that there is no indication of either spin ordering/ freezing or an appreciable spin gap down to 1.37 K, which is lower than 1% of J. This result strongly suggests that this system is in the quantum spin-liquid state with no appreciable spin gap, which has been long sought after.