Large magnetocaloric effect and magnetoresistance behavior in Gd

We report a large entropy change (ΔS) below 300 K, peaking near TC = 220 K, due to isothermal change of magnetic field, for Gd4Co3, with a refrigeration capacity higher than that for, say, LaFe11.4Si1.6, ordering magnetically in the same temperature range. A noteworthy finding is that the isothermal magnetization is nonhysteretic – an important criterion for magnetic refrigeration without loss. ΔS behavior is also compared with that of magnetoresistance