Variation of disorder in superconducting glassy metals

Abstract

The impact of increased disorder on superconducting Tc and Hc2 of amorphous Zr-Cu and Hf-Co has been studied. In these highly disordered materials, disorder was incrementally increased by irradiation with fast neutrons of low intensity. Increased resistivity, increased magnitude of dρ/dT, and smearing of the x-ray-diffraction patterns, confirm the increased disorder. The irradiation effects on ρ and Tc depend on the amorphous system, but when the Tc depression is plotted vs resistivity increase, all data fall on the same curve. Tc data are well described by the Fukuyama-Ebisawa-Maekawa theory. The normalized critical field h*(t) increases at low temperatures with increasing disorder. This cannot be explained by present theories.

Source-reported materials — not catalogue approval

Similar papers