Effects of Hydrostatic Pressure on the Curie Temperature of Ni-Based Alloys (Ni-V, -Cu, -Pd, -Pt and -Rh)

Hydrostatic pressure effects on the Curie temperature Δ T c / Δ p , have been investigated for Ni-based alloys, Ni-V, -Cu, -Pd, -Pt and -Rh, over a wide composition range. The Curie temperature was determined as an inflection point of self-inductance vs temperature curve. For all the alloys, Δ T c / Δ p 's decrease monotonically accompanying with a change in sign as solute concentration increases. Δ T c / Δ p 's as a function of T c are classified into two types. The data on Ni-V, -Cu and -Pd alloys almost lie on a line and rather rapid decrease in a concave downward curve has been obtained for Ni-Pt and -Rh alloys. It is concluded from qualitative arguments that the d -band widening with pressure almost counterbalances with compression-induced s – d transfer for the former type and the widening overcomes the transfer effect for the latter type.