Hall effect in bulk ${\mathrm{YBa}}_2$(${\mathrm{Cu}}_{1\mathrm{-}\mathit{x}}$${\mathrm{Zn}}_{\mathit{x}}$${)}_3$${\mathrm{O}}_{7\mathrm{-}\mathrm{\delta }}$

The Hall effect and the electrical resistivity have been measured in bulk samples having the general composition ${\mathrm{YBa}}_2$(${\mathrm{Cu}}_{1\mathrm{-}\mathit{x}}$ ${\mathrm{Z}}_{\mathit{x}}$ ${)}_3$ ${\mathrm{O}}_{7\mathrm{-}\mathrm{\delta }}$ for 0<x<0.06, in the temperature range 20–300 K, and for magnetic fields up to 5 T. The linear temperature dependence of the resistivity was observed for all the doped samples between 100 and 300 K. The temperature dependence of the carrier concentration and the ${\mathit{T}}^2$ dependence of the inverse Hall mobility [${\mathrm{\mu }}_{\mathit{H}}^{\mathrm{-}1}$(${\mathit{T}}^2$)] show an anomaly at a temperature around 230 K. These results are discussed in the framework of existing theories.