2-PHASE MODEL FOR THE MAGNETIC-SUSCEPTIBILITY OF HIGH-T-C SUPERCONDUCTORS

We calculate the magnetic susceptibility for the CuO2 plane in high-T- c superconductors based on a two-phase model. Starting from the three- band Hubbard model we arrive at an explicit expression for the total m agnetic susceptibility that can be separated into two distinct parts: (i) an antiferromagnetically correlated Heisenberg type term and (ii) a renormalized two-dimensional conductive term. The doping dependences of the antiferromagnetic (Q = (pi, pi)) and metallic like (q = (0, 0) ) contribution to the static magnetic susceptibility are discussed and compared with experimental results.