Magnetic Properties of t-J Model

Abstract

The dynamical spin susceptibility χ(q, ω), 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, χ(q, 0), and Im χ(q, ω) at various energy, ω, have been calculated. We found; 1) χ(0, 0) has only weak temperature dependence 2) T₁T∝(T+θ) for T\gtrsim0.1J with θ linearly dependent on the doping rate, δ 3) T₁T has a minimum at T=(0.1∼0.2)J 4) Im χ(q, ω) at q=Q≡(π, π) has a gap like structure as a function of ω if the temperature is low. All these are consistent with experimental results.