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The net entropy change corresponding to the charge carriers in a Ni-dopedFeRh bulk polycrystal was experimentally evaluated in a single sample using lowtemperature heat capacity experiments with applied magnetic field, and usingSeebeck effect and Hall coefficient measurements at high temperatures acrossthe first order transition. From the heat capacity data a value for theelectronic 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 obtainedform the Seebeck coefficient. Additionally, the analysis of the Seebeckcoefficient allows tracing the evolution of the electronic entropy change withapplied magnetic field. An increase of the electronic entropy with increasingapplied magnetic field is evidenced, as high as 10 percent at 6 T.

Thermoelectric determination of electronic entropy change in Ni-doped FeRh