MAGNETIC-PROPERTIES OF T-J MODEL

The dynamical spin susceptibility chi (q, omega), of the t-J model in two-dimensional square lattice have been studied based on the mean field approximation to the slave-boson formalism. The static spin susceptibility, chi (q, 0), and Im chi (q, omega) at various energy, omega, have been calculated. We found; 1) chi (0,0) has only weak temperature dependence 2) T1T is-proportional-to (T + theta) for T greater-than-or-similar-to 0.1 J with theta-linearly dependent on the doping rate, delta-3) T1T has a minimum at T = (0.1 approximately 0.2)J 4) Im chi (q, omega) at q = Q = (pi, pi) has a gap like structure as a function of omega if the temperature is low. All these are consistent with experimental results.