Abstract
We performed $^{13}\mathrm{C}$ NMR measurements on the quasi-one-dimensional (Q1D) charge-ordered system $(\mathrm{DI}\ensuremath{-}DCNQI{)}_{2}\mathrm{Ag}$ under ambient and applied pressure to clarify the pressure-temperature phase diagram. For pressures up to 15 kbar, the NMR spectra exhibit complicated splitting at low temperatures, indicating a ``generalized 3D Wigner crystal'' state. In this pressure region, we find that increased pressure causes a decrease in the charge disproportionation ratio, along with a decrease in the transition temperature of the generalized 3D Wigner crystal. In the high-pressure region, near 20 kbar, where a 1D confined liquid crosses over to a 3D Fermi liquid at high temperatures, the ground state is replaced by a nonmagnetic insulating state that is qualitatively different from the generalized 3D Wigner crystal.
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