Izvorni znanstveni članak
Superconductivity and room temperature coefficient of resistance in Zr-3d glassy alloys
Ramir Ristić
; Faculty of Education, POB 144, 31000 Osijek, Croatia
Sažetak
The measurements of the superconducting transition temperatures Tc and the resistivity variation, Including the room temperature coefficient of resistivity α = (d ln ρ/dT)273, have been made for three binary Zr-3d (3d=Co, Ni or Cu) amorphous alloy systems and a number of ternary Zr2(Ni100−xMx)1 amorphous alloys (M=Ti, V, Cr, Mn, Fe, Co or Cu). In binary alloys, Tc decreases with decreasing Zr-content in agreement with the results of the photoemission studies and heat capacity measurements. However, the proportionality between the electron-phonon coupling constant λ (deduced from Tc) and dρ/dT predicted by the Ziman model is not generally valid. The variation of Tc and α in ternary alloys are strongly affected by the magnetic correlations for M = Cr and Mn. The observed α < 0 for all alloys can be qualitatively explained in terms of incipient electron localization.
Ključne riječi
Hrčak ID:
299570
URI
Datum izdavanja:
1.9.1995.
Posjeta: 169 *