Ab initio couplings in Fe

Magnetoelastic coupling in gamma-iron.
S. V. Okatov, Yu. N. Gornostyrev, A. I. Lichtenstein, M. I. Katsnelson
ArXiv 1111.4432 (2011)

The exchange parameter as a function of interatomic distance to the n-th neighbour Jn(Rn) for different c/a ratios.