Magnetic field dependence of the resistivity in hydrogen-doped Zr-Fe metallic glass

We present the results for the magnetic field dependence of the electrical resistivity in hydrogen-doped Zr68Fe32 metallic glasses. The undoped sample is paramagnetic down to very low temperatures ( < 1 K) because of pronounced spin fluctuations. The observed magnetoresistance is positive and increases with hydrogen concentration. The results have been analyzed using a renormalized expression for the magnetoresistivity which takes into account the exchange enhancement of the spin-splitting contributions (through the Stoner factor) to the usual weak localization and electron-electron interaction terms. The magnetore-sistivity enhancement of hydrogen-doped Zr68Fe32 has been attributed to the increase of the Stoner factor (1 − I)−1, and of the spin-scattering rate τs−1. That increase indicates enhancement of spin fluctuations with hydrogen.