  Longitudinal and transverse transport coefficients of the Ba(Fe1-xCox)2As2
single crystals with x = 0, 0.045, 0.06 and 0.244 were measured in the
temperature range 1.4 - 300 K and in magnetic fields up to 12.5 T. The
resulting data were used to determine the temperature dependence of the Hall
Lorenz number (Lxy) and its evolution with doping. Lxy is defined by the
electronic contributions to the thermal and electrical conductivities and it is
found to differ from its canonical behavior. This shows the emergence of a
pseudogap in samples at intermediate doping.
