  Electronic structures, exchange interaction mechanism between magnetic ions
and Curie temperature of Vanadium - doped Nitrides (AlN, GaN, and InN) are
studied within KKR-LSDA-CPA. It is found that the ferromagnetic super-exchange
interaction mechanism is dominant at low concentrations of Vanadium, but the
anti-ferromagnetic super-exchange interaction appears and reduces the
stabilization of ferromagnetism at sufficiently high concentrations (x > 0.10),
especially for Vanadium-doped AlN and Vanadium- doped GaN. The estimation of
the Curie temperature within the mean field approximation shows the Curie
temperature of Vanadium-doped Nitrides exceeding the room temperature with a
few constituents of Vanadium.
