Pressure effect on the Curie temperature in dilute ferromagnetic alloys

The pressure dependence of the Curie temperature dT C /dP in dilute transition metal alloys and rare earth Co 2 compounds is calculated in the combined model of localised spins and itinerant d electrons. It is found that dT C /dP varies as -T C at low T C and this result agrees qualitatively with many experimental results in dilute transition metal alloys. The calculated values of d ln T C /d ln V for Pd-Fe, Pd-Co, Pd-Ni, Pt-Fe and Pt-Co alloys and for the GdCo 2 compound are compared with the experimental results. The calculated values of d ln T C /d ln V for Pd-Fe alloys agree well with the experimental values, which show a maximum at about 60K. The calculated results predict that there also exists a maximum in the experimental values of d ln T C /d ln V for (Gd-Y)Co 2 compounds and Pd-Co alloys.