Magnetism and transport in the t-t'-J model

The normal state properties of high-T_c cuprates are investigated in terms of an extended t-J model using a spin-rotation-invariant slave-boson (SB) technique. A second-neighbour hopping t' of different sign is included to account for band structure effects of both hole- and electron-doped systems. Using the renormahzed SB quasiparticle band, the doping and temperature dependence of the Hall resistivity are explored, the results being in accord with experiments on La_2–SrCuO₄ (LSCO), YBa₂Cu₃O_6+x (YBCO), and Nd_2–CeCuO₄ (NCCO). The calculated-dependence of the dynamical magnetic structure factor S() shows reasonable agreement with the qualitative features of the neutron scattering cross sections in metallic LSCO- and YBCO-type systems.