engleski

Electrical transport in ternary glassy Zr_2(Ni_(1- x)M_x)_1 alloys

The addition of a third transition element M (Ti, V, Cr, Mn, Fe, Co or Cu) to the amorphous Zr2Ni alloy causes, for fixed M content, a systematic decrease in superconducting transition temperature T-c, magnetic susceptibility chi and coefficient A? of linear conductivity variation Delta sigma proportional to T below 100 K (which measures the electron-phonon interaction) in going from M = Ti towards M = Cu. A minimum of A and Delta T-c/Delta x (gradient of the change in the superconducting transition temperature with concentration of M) and maximum of Delta chi for M = Cr and Mn can be associated with the appearance of the magnetic correlation in these alleys. The measurements of the magnetoresistivity in the field B up to 1.2 T and for different temperatures show that the magnetoresistivity also increases when going from M = Cu towards hi = Ti ; we can explain magnetoresistivity as a combination of the contributions of the electron localization and superconducting fluctuations. Our results agree with measurements of UPS spectra and specific heat capacity for similar alloys.

glassy alloys ; electrical transport ; localization ; metallic glasses

Rad je prezentiran na skupu Ninth International Conference on Rapidly Quenched and Metastable Materials, održanom od 25.-30.08.1996., Bratislava, Slovačka ; P. Duhaj ; Mrafko, P. ; Svec, P.D. (ur.)