Pseudogap and Spin Fluctuations in the Normal State of the Electron-Doped Cuprates

We present reliable many-body calculations for the $t\mathrm{\text{−}}{t}^{\prime }\mathrm{\text{−}}{t}^{\prime \prime }\mathrm{\text{−}}U$ Hubbard model that explain in detail the results of recent angle-resolved photoemission experiments on electron-doped high-temperature superconductors. The origin of the pseudogap is traced to two-dimensional antiferromagnetic spin fluctuations whose calculated temperature-dependent correlation length also agrees with recent neutron scattering measurements. We make specific predictions for photoemission, for neutron scattering, and for the phase diagram.