Studies on novel ground states and the mechanism of pressure-induced superconductivities in organic triangular-lattice Mott insulators

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Theorists have considered that exotic magnetism and superconductivity are possibly realized in triangular-lattice systems. I have experimentally revealed that organic triangular-lattice X[Pd(dmit)_2]_2 systems shows these exotic states. The system X=(C_2H_5)(CH_3)_3Sb was found to show a quantum spin-liquid state. I also found that the ground state of this quantum spin liquid has exotic hidden order unforeseen by classical physics. I revealed that the system X=(C_2H_5)(CH_3)_3P shows exotic superconductivity which is different from the usual d_<x2-y2> superconductivity mediated by (π, π) antiferromagnetic fluctuations.