ASPECTS OF THE PHASE-DIAGRAM OF THE 2-DIMENSIONAL T-J MODEL

The phase diagram of the 2D t-J model is investigated using high-temperature expansions. Series for the Helmholtz free energy, the inverse compressibility, the chemical potential, and the uniform spin susceptibility through tenth order are calculated and analyzed. A region of phase separation is found at T = 0 for J/t lying above a line extending from J/t = 3.8 at zero filling to J/t = 1.2 at half filling. For very small J/t near half filling where the Nagaoka effect is possible, we find a region of divergent uniform magnetic susceptibility at T = 0.