On the question of ferromagnetism in alkali metal thin films

Details On the question of ferromagnetism in alkali metal thin films On the question of ferromagnetism in alkali metal thin films

2007-11-29

arxiv.org/abs/0711.4744v1

Physics

Condensed Matter

Materials Science

Scientific paper

Electronic and magnetic structure of $(100)$ films of K and Cs are calculated within the plane-wave projector augmented wave (PAW) formalism of the density functional theory (DFT) using both local spin density approximation (LSDA) and the PW91 generalized gradient approximation (GGA). Only a 6 layer Cs film is found to have a ferromagnetic (FM) state which is degenerate with a paramagnetic (PM) state within the accuracy of these calculations. This is at variance with the results obtained from a finite thickness uniform jellium model (UJM). Implications of these results for the experiments on transition metal doped alkali metal thin films and bulk hosts are discussed.

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