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

Abstract

The resistivity, magnetoresistance and in-field heat capacity measurements were performed on GdPt${}_2$ intermetallic compound. The magnetocaloric parameters $\Delta T_{ad}$ and $-\Delta S$ were derived from the in-field heat capacity data. Comparison has been made between the magnetocaloric effect $-\Delta S$ and difference in resistivity $-\Delta \rho$ $(=\rho (H)-\rho (0))$ as a function of temperature. There is distinct difference in the temperature dependence of $-\Delta S$ and $-\Delta \rho$ below the ferromagnetic transition temperature. However after removing the domain wall contribution from $-\Delta \rho$, the nature of $-\Delta S$ 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.

arXiv commentRevTex 4 pages, 6 figures

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