Cryogenic magnetocaloric effect in a ferromagnetic molecular dimer

El pdf del artículo es la versión post-print.Molecoolers: An unprecedentedly large cryogenic magnetocaloric effect is observed in gadolinium acetate tetrahydrate (see picture, Gd pink, O red, C gray). The change in its magnetic entropy is ascribed to the high magnetic density combined with dominant ferromagnetism. For the first time in a molecular complex, direct measurements of the magnetocaloric effect corroborate indirect estimates based on heat capacity and magnetization.This work was supported by the Spanish MICINN through grants MAT2009-13977-C03, MAT2007-61621 and CSD2007-00010.Peer Reviewe