On the Competition between Ferromagnetic and Antiferromagnetic States in   Sr$_2$MnMoO$_6
  It is argued that the magnetic behavior of Sr$_2$MnMoO$_6$ is determined by the existence of two total energy minima corresponding to the metallic ferromagnetic and insulating antiferromagnetic states, which may be nearly degenerate depending on the magnitude of the breathing distortion. 
I. V. Solovyev