ABSTRACT
The electronic and thermal transport properties give information regarding the nature of the charge and thermal carriers and how they are scattered. The most common way of studying the change in normal-state transport properties with variation in the concentration of charge carriers is by site-selective substitution. Appropriate doping may occur for the thallium barium calcium copper oxide (TBCCO) sites. Although there are many reports of measurements of one or another transport property after selective doping at a particular site, there are no systematic studies of all three normal-state transport properties (resistivity, thermopower, and Hall effect) for a particular substitution. Very recently, the first measurements of thermal conductivity on single-crystal TBCCO have been made on small 2212 crystals by Cao et al. Selected experimental data can apparently be used to lend support to many different theories of transport in the normal state for Tl-based superconductors. The experimental data are sometimes confusing and often incomplete.
