Correlation between structural relaxation enthalpy and superconducting properties of amorphous Zr70Cu30 and Zr70Ni30 alloys

摘要: The anneal-induced change in the superconducting properties together with irrecoverable relaxation enthalpy (ΔHi,exo) and recoverable (ΔHr,endo) of amorphous Zr70Cu30 Zr70Ni30 alloys was examined. increase Δi,exo degradation ofTc progress logarithmically annealing timeta a temperature range 373 to 523 K. activation energy attempted frequency were respectively estimated be 1.5eV 6.6 × 1013 sec−1 for ΔHi,exo 1.9×1014 ofTc. structure exerts little effect onTc. Based on agreement between kinetic parameters changes andTc, it appears that is associated structural as result annihilation frozen-in defects topological compositional atomic rearrangement. values being order Debye suggest processes occur more or less independently from each other. dressed density electronic states at Fermi level,N(Ef)(1+λ), determined measured ofρn -(dHc2/dT)Tc using GLAG (theory), found have similar dependence by thus inferred resulting decrease inλ due inN(Ef) increases inM ω. Furthermore, resulted significant depression fluxoid pinning force interpreted an enhanced homogeneity scale coherence length.