ABOUT SMOOTH PHASE-TRANSITIONS IN FERROMAGNETIC INVAR-ALLOYS

Strongly disordered ferromagnetic alloys which exhibit magnetic inhomo geneities are described in the frame of the Ginzburg-Landau theory by introducing local, spatially varying Curie temperatures. It is shown t hat this leads to a smooth phase transition. Furthermore it is shown t hat the maxima and minima of the specific heat, the volume thermal exp ansion coefficient and of the compressibility deviate from the Curie t emperature.