ABOUT THE LOCAL CURIE-TEMPERATURE DISTRIBUTION OF INVAR-ALLOYS

Strongly disordered ferromagnetic alloys which exhibit magnetic inhomo geneities are described in the frame of a generalized Ginzburg-Landau theory by averaging the Ginzburg-Landau energy of a subsystem with a d efinite Curie temperature over the Curie temperature of all subsystems of the inhomogeneous magnetic system. It is shown that this leads to the rough scaling of a smooth phase transition. Furthermore the distri bution function of the Curie temperature is derived from the experimen tal data of the specific heat, the volume thermal expansion coefficien t and the compressibility.