Normal-state Nernst coefficient in YBa2Cu3-xCoxOy with different cobalt content

We report experimental data on the temperature and concentration dependence s of the Nernst coefficient in the normal state for the YBa2Cu3-xCoxOy cera mic samples with increasing Co content up to x = 0.3. The Nernst coefficien t is positive, and its value increases almost linearly with x. The temperat ure dependences of Q have been analyzed on the basis of a narrow band model , together with data on other transport coefficients. Using a complex quant itative analysis of four transport coefficients, we were able to estimate t he carrier mobility and to elucidate a character of the energy dependence o f the relaxation time. (C) 1998 Academic Press.