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High-Doping Regime in a Planar Model for Strongly Correlated Electrons

The exact diagonalization study of the effective single-band (t-J) model for strongly correlated electrons in a layered system of 16 cells, has been extended to a larger number of holes, i.e. up to Nh = 4. A higher concentration of holes definitely reduces the range of antiferromagnetic correlations and the correlated state behaves more as a dilute system of correlated fermions. Still the hole-density correlations and moreover the four-point density correlations reveal a tendency to pairing in the intermediate regime of exchange couplings J/t, in contrast to the formation of droplets at larger J/t.