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# Spin Liquid State in an Organic Mott Insulator with Triangular Lattice

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### Abstract

$$^{1}$$H NMR and static susceptibility measurements have been performed in an organic Mott insulator with 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 $$J$$ $$\sim$$ 250 K. Regardless of the large magnetic interactions, the $$^{1}$$H NMR spectra show no indication of long-range magnetic ordering down to 32 mK, which is four-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.

### Author and article information

###### Journal
19 July 2003
###### Article
10.1103/PhysRevLett.91.107001
cond-mat/0307483