  Motivated by recent reports (Phys. Rev. B\textbf{80}, 241102) of
room-temperature ferromagnetism in vanadium-oxide based superlattices, a
single-site dynamical mean field study of the dependence of the
paramagnetic-ferromagnetic phase boundary on superlattice geometry was
performed. An examination of variants of the experimentally determined crystal
structure indicate that ferromagnetism is found only in a small and probably
inaccessible region of the phase diagram. Design criteria for increasing the
range over which ferromagnetism might exist are proposed.
