  It has been shown that for the highly-correlated d4 electronic system the
spin-orbit interactions produce, even in case of the cubic crystal-field
interactions, a singlet ground state. Its magnetic moment grows rapidly with
the applied magnetic field approaching 4 uB for the Eg state, but only 3 uB for
the T2g state. The applicability of the present results to the Mn3+ ion in
LaMnO3 is discussed.
  Keywords: crystal-field, spin-orbit, orbital moment.
  PACS: 71.70.E, 75.10.D
