Study and Analysis of the Normal-State Nernst Coefficient in the $\mathrm{Y}_{1-\mathrm{x}}\text{Ca}_{\mathrm{x}}\text{Ba}_{2}\text{Cu}_{2.6}\text{Cu}_{2.6}\text{Co}_{0.4}\mathrm{O}_{\mathrm{y}}$ System

We present the results on the normal-state Nernst coefficient,
$Q$
, in the
$\mathrm{Y}_{1-x}\text{Ca}_{x}\text{Ba}_{2}\text{Cu}_{2.6}\text{Co}_{0.4}\mathrm{O}_{y}$
system. We have measured the temperature dependences of the Nernst coefficient in samples with different levels of additional calcium doping (
$x=0-0.2$
) and analyzed them quantitatively within a narrow-band model. The use of data on the parameters of the energy spectrum, previously obtained by the thermopower analysis for the same samples, allowed us to satisfactory describe the experimental
$Q(T)$
dependences and to determine the values of the charge carrier mobility and the degree of asymmetry of the dispersion law for all samples. Variation of these values with increasing calcium content is discussed taking into account the changes in other energy spectrum parameters.