Specific Heat and Electrical Resistivity of Exchange-Enhanced Dilute Pt -Ni Alloys

Experimental measurements of the specific heat and electrical resistivity of dilute Pt-Ni alloys have been made at temperatures from {~}1.2 to 4.2^∘{}K. Specimen compositions were 1.0-, 3.4-, 7.7-, and 12.8₅-at.%Ni for the specific-heat work and 0.67-, 1.3-, 2.0-, 4.0-, and 9.4-at.%Ni for the resistivity work. The specificheat data for each alloy are well fitted by a relation of the form C=γT+β^'T³, the resistivity data by a relation of the form ρ=ρ₀+AT². The dependence of γ, β^', and A upon the Ni concentration c may be expressed as follows: γ^-1dγdc3 over the entire range of composition investigated; for the lower concentrations only, (1β^')(dβ^'dc)~-3 to -7 and A^-1dAdc28. The experimental results are used to evaluate current theories of localized spin-fluctuation effects; qualitative agreement is good, although quantitative agreement is very limited.