Z. Soskic et Bb. Stojic, Influence of the Fe2+ ion triple clusters on the magnetic susceptibility of Fe-based diluted magnetic semiconductors, J MAGN MAGN, 236(3), 2001, pp. 331-338
Low lying energy levels of Fe2+ ion triples in the cubic-structure iron-bas
ed diluted magnetic semiconductors are calculated on the basis of a model w
hich includes crystal field, spin-orbit interaction, Zeeman interaction and
Heisenberg-type exchange interaction. Using this energy level diagram the
magnetic susceptibility of a crystal is calculated in the nearest-neighbour
(NN) and in the extended NN pair approximation, We find that the Fe2+ ion
triples contribute to the temperature dependent susceptibility up to the lo
west temperatures investigated, T greater than or equal to 1 K. It appears
that the triple Fe2+ ion clusters may explain at least a part of the low-te
mperature increase of the magnetic susceptibility which is observed in thes
e magnetic materials. (C) 2001 Elsevier Science B.V. All rights reserved.