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

$^{1}\mathrm{H}$ NMR and static susceptibility measurements have been performed in an organic Mott insulator with a nearly isotropic triangular lattice, $\ensuremath{\kappa}\mathrm{\text{\ensuremath{-}}}(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\mathrm{\text{\ensuremath{-}}}\mathrm{T}\mathrm{T}\mathrm{F}{)}_{2}{\mathrm{C}\mathrm{u}}_{2}(\mathrm{C}\mathrm{N}{)}_{3}$, 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 $J\ensuremath{\sim}250\text{ }\text{ }\mathrm{K}$. Regardless of the large magnetic interactions, the $^{1}\mathrm{H}$ NMR spectra show no indication of…

• JS
  Japan Society for the Promotion of Science

  Award: 14204033