The similar dependence of the magnetocaloric effect and magnetoresistance in TmCu and TmAg compounds and its implications

We report the results of resistivity (ρ), magnetoresistance (MR) and in-field heat capacity ( C ) measurements on TmCu and TmAg compounds. Despite the different nature of magnetic transitions - first-order in TmCu and second-order in TmAg - the magnetocaloric effect (MCE) obtained from in-field heat capacity data is similar for higher fields. There are striking similarities between the MCE and MR as a function of temperature as well as magnetic field ( H ). We have shown that in the paramagnetic state, MCE has - H 2 dependence due to the suppression of spin fluctuation. Since the MCE and MR are related with thermodynamic and transport properties respectively, two different properties of a system and the similarities between the two indicate a deeper relation between the origin of MR and MCE.