M. Deeg et al., MAGNETIC PHASE-DIAGRAM AND TRANSPORT-PROPERTIES OF THE T-J MODEL - A SPIN-ROTATION INVARIANT SLAVE-BOSON APPROACH, Europhysics letters, 26(2), 1994, pp. 109-115
On the basis of a spin-rotation-invariant formulation of the Kotliar-R
uckenstein slave-boson representation the t-J model is studied on a sq
uare lattice. The ground-state phase diagram is derived numerically, b
y taking into account also incommensurate magnetic structures. The dom
ain of phase separation is determined. The correlation-induced band re
normalization is in excellent agreement with Lanczos results. We calcu
lated the doping dependence of Hall resistivity and thermopower using
the relaxation time approximation, the results being in accord with ex
periments on La2-deltaSrdeltaCuO4.