Influence of Domain Wall on Magnetocaloric Effect in GdPt${}_2$

The resistivity, magnetoresistance and in-field heat capacity measurements were performed on GdPt${}_2$ intermetallic compound. The magnetocaloric parameters $\mathrm{\Delta }{T}_{ad}$ and $-\mathrm{\Delta }S$ were derived from the in-field heat capacity data. Comparison has been made between the magnetocaloric effect $-\mathrm{\Delta }S$ and difference in resistivity $-\mathrm{\Delta }\rho$ $(=\rho (H)-\rho (0))$ as a function of temperature. There is distinct difference in the temperature dependence of $-\mathrm{\Delta }S$ and $-\mathrm{\Delta }\rho$ below the ferromagnetic transition temperature. However after removing the domain wall contribution from $-\Delta \rho$,thenatureof$-\Delta S$and$-\Delta \rho$ dependence as a function of temperature are similar. Our observation indicates that the domain wall contribution in magnetocaloric effect is negligible in spite of the fact that it has significant contribution in magnetotransport.