A NEW ANOMALY IN THIN NI-CU MULTILAYERED FILMS

Recent magnetic studies revealed unusual properties of Ni(n)-Cu(n) mul tilayered films, resembling spin-glass-like behaviour. We report new a nomalies observed in transport properties. The derivative drho(m)/dT e xhibits a peak in all the samples (n = 3, 4, 7) around T almost-equal -to 70 K, and the magnetoresistance (DELTArho/rho) confirms its magnet ic origin. Whereas at T almost-equal-to T, DELTArho/rho saturates at a constant value (H greater-than-or-equal-to 3 kOe), for T > T it ex hibits a negative slope, but for T < T this slope is positive.