Magnetovolume instabilities and ferromagnetism versus antiferromagnetism in bulk fcc iron and manganese

Spin Density Wave States in Transition Metals

On the basis of an electronic structure calculation, spin density wave states of fcc Fe and Cr are discussed with particular attention to the difference between them. The wave vector at which the unenhanced spin susceptibility of nonmagnetic fcc Fe or Cr becomes maximum is shown to correspond well to the observed wave vector of spin density wave. It is found that a nesting of the Fermi surface hardly contributes to determining the wave vector of the susceptibility maximum for fcc Fe, which exhibits a remarkable contrast to Cr. Another reasoning of the susceptibility maximum is extended from a real space viewpoint. Difference in characteristics of the spin density wave state between fcc Fe and Cr is further illustrated by the electronic structure calculation of spin density wave states with finite magnetic moments.