Gapless spin liquid of an organic triangular compound evidenced by thermodynamic measurements.
Gapless spin liquid of an organic triangular compound evidenced by thermodynamic measurements.
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DOI：
10.1038/ncomms1274
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发表时间：
2011
影响因子：
16.6
通讯作者：
Kato R
中科院分区：
文献类型：
--
作者：
Yamashita S;Yamamoto T;Nakazawa Y;Tamura M;Kato R
在受挫磁系统中，远程有序是被禁止的，即使在极低的温度下，能量状态的简并仍然存在。在一定条件下，这些系统形成奇异的量子自旋-液体基态，其中强相关自旋在自旋晶格中波动。本文研究了EtMe3Sb[Pd(dmit)2]2阴离子自由基自旋液体的热力学性质，其中dmit表示1,3-二硫-2-硫-4,5-二硫酸盐。该化合物是一种具有二维三角形晶格结构的有机二聚体莫特绝缘体。我们通过检查低温热容中的t -线性热容系数γ，提出了形成无间隙自旋液体的明显证据。通过与κ-(BEDT-TTF)2Cu2(CN)3的比较分析，讨论了二聚体基有机体系中新自旋液体的总体情况。我们还报道了由Pd(dmit)2相图固有的一种临界性产生的γ的异常增强。受挫的磁系统可以形成奇异的量子自旋-液体基态，其中强相关自旋在自旋晶格中波动。在这里，发现电荷转移化合物的低温电子态形成无间隙自旋液体。
In frustrated magnetic systems, long-range ordering is forbidden and degeneracy of energy states persists, even at extremely low temperatures. Under certain conditions, these systems form an exotic quantum spin-liquid ground state, in which strongly correlated spins fluctuate in the spin lattices. Here we investigate the thermodynamic properties of an anion radical spin liquid of EtMe3Sb[Pd(dmit)2]2, where dmit represents 1,3-dithiole-2-thione-4,5-dithiolate. This compound is an organic dimer-based Mott insulator with a two-dimensional triangular lattice structure. We present distinct evidence for the formation of a gapless spin liquid by examining the T-linear heat capacity coefficient, γ , in the low-temperature heat capacity. Using comparative analyses with κ-(BEDT-TTF)2Cu2(CN)3, a generalized picture of the new spin liquid in dimer-based organic systems is discussed. We also report anomalous enhancement of γ, produced by a kind of criticality inherent to the Pd(dmit)2 phase diagram. Frustrated magnetic systems can form an exotic quantum spin-liquid ground state, in which strongly correlated spins fluctuate in the spin lattices. Here, the low-temperature electronic state of a charge-transfer compound is found to form a gapless spin liquid.
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