Spin liquid state in an organic Mott insulator with a triangular lattice
Spin liquid state in an organic Mott insulator with a triangular lattice
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DOI：
10.1103/physrevlett.91.107001
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发表时间：
2003-09-05
影响因子：
8.6
通讯作者：
Saito, G
中科院分区：
文献类型：
--
作者：
Shimizu, Y;Miyagawa, K;Saito, G
在具有近各向同性三角晶格的有机Mott绝缘体kappa-（BEDT-TTF）（2）Cu-2（CN）（3）中进行了H-1 NMR和静态磁化率测量。静态磁化率用自旋S = 1/2反铁磁三角格子海森堡模型描述，交换常数J近似为250 K。不管大的磁相互作用，H-1 NMR谱显示没有迹象表明长程磁有序下降到32 mK，这是4个数量级小于J.这些结果表明，量子自旋液体状态是实现在压力下出现的超导状态的紧密接近。
H-1 NMR and static susceptibility measurements have been performed in an organic Mott insulator with a nearly isotropic triangular lattice, kappa-(BEDT-TTF)(2)Cu-2(CN)(3), which is a model system of frustrated quantum spins. The static susceptibility is described by the spin S = 1/2 antiferromagnetic triangular-lattice Heisenberg model with the exchange constant J similar to 250 K. Regardless of the large magnetic interactions, the H-1 NMR spectra show no indication of long-range magnetic ordering down to 32 mK, which is 4 orders of magnitude smaller than J. These results suggest that a quantum spin liquid state is realized in the close proximity of the superconducting state appearing under pressure.