Mott Transition from a Spin Liquid to a Fermi Liquid in the Spin-Frustrated Organic Conductor kappa-(ET)[sub 2]Cu[sub 2](CN)[sub 3]

  • Kurosaki Y
  • Shimizu Y
  • Miyagawa K
 et al. 
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Abstract

The pressure-temperature phase diagram of the organic Mott insulator kappa-(ET)2Cu2(CN)3, a model system of the spin liquid on triangular lattice, has been investigated by 1H NMR and resistivity measurements. The spin-liquid phase is persistent before the Mott transition to the metal or superconducting phase under pressure. At the Mott transition, the spin fluctuations are rapidly suppressed and the Fermi-liquid features are observed in the temperature dependence of the spin-lattice relaxation rate and resistivity. The characteristic curvature of the Mott boundary in the phase diagram highlights a crucial effect of the spin frustration on the Mott transition.

Author-supplied keywords

  • metal-insulator transition
  • organic superconductor

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Authors

  • Y Kurosaki

  • Y Shimizu

  • K Miyagawa

  • K Kanoda

  • G Saito

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