  The net entropy change corresponding to the charge carriers in a Ni-doped
FeRh bulk polycrystal was experimentally evaluated in a single sample using low
temperature heat capacity experiments with applied magnetic field, and using
Seebeck effect and Hall coefficient measurements at high temperatures across
the first order transition. From the heat capacity data a value for the
electronic entropy change \(\Delta S_{el}\approx8.9\) J\ kg\(^{-1}\)K\(^{-1}\)
was extracted, whereas a value of up to 4 J\ kg\(^{-1}\)K\(^{-1}\) was obtained
form the Seebeck coefficient. Additionally, the analysis of the Seebeck
coefficient allows tracing the evolution of the electronic entropy change with
applied magnetic field. An increase of the electronic entropy with increasing
applied magnetic field is evidenced, as high as 10 percent at 6 T.
