Anomalous magnetoresistivity of the superconducting Zr80Pt20 system in quasicrystalline and amorphous states

The binary icosahedral Zr₈₀Pt₂₀ system has been synthesized during the crystallization of an initially amorphous alloy fabricated by melt quenching on the surface of a rotating copper wheel. The temperature and field dependences of the electrical resistivity and magnetoresistivity of the icosahedral and amorphous phases are studied and compared in a temperature range of 1.5–300 K and magnetic fields up to 8 T. Superconductivity has been detected for the first time in the icosahedral and amorphous phases of the Zr₈₀Pt₂₀ system. For both phases, the magnetoresistivity is positive and depends anomalously on the magnetic field. The anomalous behavior of magnetoresistivity is satisfactorily described by the theory of weak localization and electron-electron interaction in three-dimensional disordered systems, which takes into account electron scattering by superconducting fluctuations. The absolute values and temperature dependences of the electron-electron interaction constant and the times of inelastic scattering of conduction electrons are estimated for the icosahedral and amorphous phases of this binary system.