We propose a new type of liquid state of charges in the spinless fermion system on a triangular lattice under strong inter-site Coulomb interactions, V. In the strong coupling limit (t=0),
the ground state is classical and disordered due to geometrical frustration. The introduction of small t drives the system to a partially ordered phase which we call a "pinball liquid". A possibly long range ordered Wigner crystal solid coexist with a liquid component which are moving around them like a pinball. This liquid is dominant over wide range of filling, even away from the regular triangle. The phase diagram of the present system on an anisotropic triangular lattice is given and a relevance to the organic crystal, θ-ET2X is discsussed.
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