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FIZIKA A 4 (1995) 3, 605-614
 
SUPERCONDUCTIVITY AND ROOM TEMPERATURE COEFFICIENT OF RESISTANCE IN
Zr-3d GLASSY ALLOYS
RAMIR RISTI�
Faculty of Education, POB 144, 31000 Osijek, Croatia
Dedicated to Professor Mladen Pai� 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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