Abstract
The two-dimensional t-J model in the ground state is investigated by the power Lanczos method. The pairing-pairing correlation function for -wave symmetry is enhanced in the realistic parameter regime for high- superconductors. The charge susceptibility shows divergent behavior as ∝ near half filling for the doping concentration δ, indicating that the value of the dynamical exponent z is four under the assumption of hyperscaling. The peak height of the spin structure factor (Q) also behaves as (Q)∝ near half filling, which leads to the divergence of the antiferromagnetic correlation length as ∝. The boundary of phase separation is estimated on the basis of the Maxwell construction. Numerical results are compared with experimental features observed in high- cuprates.
DOI:https://doi.org/10.1103/PhysRevB.55.1435
©1997 American Physical Society