Numerical study on pseudogap phenomena in high-Tc cuprates Original Research Article

The pseudogap phenomena observed on cuprate high-temperature superconductors are investigated based on the finite-temperature Lanczos method on the 16 sites 4×4 cluster t–J model, which includes two holes. The results clearly show the presence of the gap-like behavior in the temperature dependence of various magnetic properties; the NMR relaxation rate, the neutron scattering intensity and the static susceptibility. The effect of the external magnetic field on the pseudogap is also studied on the same model. These results are in agreement with our previous exact diagonalization studies on the one-hole system, and confirm our proposal of the predominant role of the antiferromagnetic spin correlation on the observed pseudogap behaviors.