Magnetic exchange coupling and Curie temperature of Ni(1+x)MnSb (x=0, 0.25, 0.5, 0.75, 1) from first principles

摘要

We study the dependence of magnetic interactions and Curie temperature inNi(1+x)MnSb system on the Ni concentration within the framework of thedensity-functional theory. The calculation of the exchange parameters is basedon the super-cell and frozen-magnon approaches. The Curie temperatures, Tc, arecalculated within the random-phase approximation. In agreement with experimentwe obtain decrease of the Curie temperature with increasing Ni content.