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

理论学家认为奇异磁性和超导性可能在三角晶格体系中实现。我通过实验揭示了有机三角晶格X[Pd(dmit)_2]_2体系具有这些奇异态。发现X=(C_2H_5)(CH_3)_3Sb体系表现出量子自旋液态。我还发现这种量子自旋液体的基态具有经典物理学无法预见的奇特隐藏秩序。我发现X=(C_2H_5)(CH_3)_3P体系表现出奇异的超导性，它不同于通常由（π, π）反铁磁波动调节的d_<x2-y2>超导性。

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.