The magnetic structure of Cr2F5

The magnetic structure of Cr 2 F 5 has been determined by means of neutron powder diffraction. It is antiferromagnetic, with magnetic space group C2/c , the same as the crystal space group. Magnetic moments lie mainly in the ( a, c ) plane, mostly along the a axis. The observed magnetic structure does not correspond to previous predictions. New superexchange mechanisms are proposed, which take into account the specific superexchange angles. They are in agreement with the rules for superexchange coupling, the Jahn-Teller effect, and the magnetic properties of the compound. Monte Carlo simulations show that the proposed superexchange interactions are consistent with the magnetic structure.