Spin-fluctuation effects in the resistivity of Fe-Zr metallic glasses

We report for the first time clear evidence of spin-fluctuation effects in the resistivity of a metallic glass. The system studied is Fe-Zr close to, and on either side of, the critical concentration $x_c$ for ferromagnetism. A strong positive anomaly, which reaches its greatest extent around $x_c$, is seen superposed on a nonmagnetic, monotonically decreasing background. The data may be scaled into a universal curve and fitted at low temperatures by the universal expression of Kaiser and Doniach, yielding spin-fluctuation temperatures which pass through a minimum at $x_c$. .AE