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FIZIKA A 4 (1995) 3, 605-614
 
SUPERCONDUCTIVITY AND ROOM TEMPERATURE COEFFICIENT OF RESISTANCE IN
Zr-3d GLASSY ALLOYS
RAMIR RISTIĆ
Faculty of Education, POB 144, 31000 Osijek, Croatia
Dedicated to Professor Mladen Paić on the occasion of his 90th
birthday
Received 10 July 1995
Revised manuscript received 4 October 1995
The measurements of the superconducting transition temperatures Tc and the
resistivity variation, including the room temperature coefficient of resistivity a = (dlnr/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 l (deduced from Tc) and dr/dT
predicted by the Ziman model is not generally valid. The variation of Tc and a in ternary alloys are strongly affected by the magnetic
correlations for M = Cr and Mn. The observed a < 0 for all
alloys can be qualitatively explained in terms of incipient electron localization.
UDC 537.312
PACS 72.15.Cz
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