J. Phys. IV France 10 (2000) Pr3-213-Pr3-224
The normal state gap and other strange properties of cuprate superconductorsJ.R. Cooper and J.W. Loram
IRC in Superconductivity and Department of Physics, University of Cambridge, Madingley Road, Cambridge, CB3 OHE, U.K.
We summarise some of our recent work on the Normal State Gap(NSG) in hole-doped high Tc cuprates, including an empirical model for the density of states which appears to account for the effect of doping on the electronic entropy and spin susceptibility. Several features of our data such as the variations in entropy and thermoelectric power with hole content at room temperature are consistent with numerical studies of the t - J model. We note that the effect of doping on the the thermoelectric power is difficult to reconcile with the "stripes scenario". It is shown that the NSG strongly affects most superconducting properties, and, via a simple tunnelling picture, the out-of-plane resistivity and magnetoresistance in the normal state.
© EDP Sciences 2000