Effect of pressure on the Curie temperature of Fe3Pt.

Abstract

We have performed self-consistent spin-polarized calculations for ${\mathrm{Fe}}_{3}$Pt (which crystallizes in the ${\mathrm{Cu}}_{3}$Au structure) at various Wigner-Seitz radii using the linear muffin-tin orbital atomic sphere approximation method. The average magnetic moment obtained at equilibrium lattice constant (1.99${\mathrm{\ensuremath{\mu}}}_{\mathit{B}}$) is close to the experimental value (2.15${\mathrm{\ensuremath{\mu}}}_{\mathit{B}}$). We have calculated the Curie temperature of this compound at various Wigner-Seitz radii, using the model proposed by Mohn and Wohlfarth. The quantities which are obtainable from the band-structure calculations are the only requisite for this model. The variation of the Curie temperature with Wigner-Seitz radii, i.e., with pressure, ${\mathit{T}}_{\mathit{C}}$(P) is then compared with the experimental data.