Low Frequency Transport Measurements in GdSr2RuCu2O8

Low frequency transport measurements are performed on GdSr2RuCu2O8 pellets. The observed current-voltage curves are qualitatively explained in the framework of a simple phenomenological model accounting for coexistence in the sample of ferromagnetism and superconductivity. A Curie temperature K and a superconducting critical temperature K, with an onset temperature K, are extracted from the analysis of the current-voltage curves.