Abstract
Recently (Gama et al., Phys. Rev. Lett. (2004) 93(23) 237202-1) it has been observed that the MnAs compound, when submitted to an hydrostatic pressure, presents the colossal magnetocaloric effect. The pressure decreases the magnetic transition temperature (TC) causing a remarkable thermal hysteresis and then, the entropic colossal effect which is considered when the maximum isothermic en…