Interband contributions to the generalized spin susceptibility of chromium

A method based on the band wavefunctions is used to classify the contributions to the Lindhard expression for the generalized susceptibility chi 0 non (q) arising from the various bands near the Fermi surface. The method is applied to chromium at its Neel temperature where it is shown that the position of the maximum in chi 0 non (q) near the ordering wave vector is determined by the resting of the electron Fermi surface near gamma into the hole surface near H as proposed in the Lomer model. However this contribution is small compared to the contributions involving bands more than 0.5 eV from the Fermi energy, which give rise to a broad maximum at the commensurate antiferromagnetic wave vector.