Disorder and magnetic effects on the electron-transport properties of iron-chromium-boron metallic glasses

We report measurements of the electrical resistivity and magnetoresistivity of ${\mathrm{Fe}}_{80\mathrm{?}(\mathrm{hyx}}$ ${\mathrm{Cr}}_{\mathrm{x}}$ ${\mathrm{B}}_{20}$ (0≤x≤32) from 60 mK to 300 K and in magnetic fields up to 4.3 T. The results show the presence of two effects: one of nonmagnetic origin, associated with electron-electron interaction in a highly disordered system, and the other of magnetic origin, probably due to the Kondo effect and spin fluctuations. The high-field, isotropic magnetoresistivity is examined in detail and shown to be quantitatively inconsistent with the currently available models.