Sign Change of Hall-Coefficients for Amorphous Ni0.80-Xcrxp0.20 Alloys

Journals published by the American Physical Society can be found at http://journals.aps.org/The magnetic susceptibilities, resistivities, and Hall coefficients of amorphous Ni0.80-xCrxPo0.20 (0.00 less-than-or-equal-to x less-than-or-equal-to 0.40) alloys are reported. A sip change with temperature of the Hall coefficient for a single paramagnetic amorphous alloy that correlates with the temperature-dependent valence susceptibility has been observed (x = 0.20), indicating that an extraordinary contribution to R(H) is responsible for the positive Hall effect in these paramagnetic alloys. Also, an unexplained relatively large contribution to R(H) that is linear in T has been observed in some of these alloys. A gradual change in magnetic properties with composition from large cluster-dominant phase to Kondo-impurity phase has been observed