Anomalous electrical resistivity and nuclear magnetic resonance in rapidly quenched Cu-Mn-Al ribbons

The rapidly quenched Cu(67-x)-Mnx-Al33(at.%) ribbons show high electrical resistivities and low temperature coefficients of resistivity. The resistivities decrease monotonically with increasing temperature for the ribbons of more than 30(at.%) Mn concentration. In the Cu32-Mn35-Al33 ribbon, it is found by nuclear magnetic resonance measurements that the antiferromagnetic and ferromagnetic clusters of Mn atom coexist without long-range order. The anomalous resistivity behaviour of the Cu-Mn-Al ribbons is explained by the s-d interaction between conduction electrons and the clustered Mn atoms.