Hn. Oak et al., MOSSBAUER STUDIES OF SUPEREXCHANGE INTERACTION IN TETRAGONAL CUFE2O4, Physica status solidi. b, Basic research, 208(1), 1998, pp. 249-255
CuFe2O4 has been studied by Mossbauer spectroscopy and X-ray diffracti
on. The crystal is found to have a tetragonal spinel structure with th
e lattice constants a(0)=(5.805+/-0.005) Angstrom and c(0) = (8.669 +/
- 0.005) Angstrom. The iron ions are in ferric Fe3+ states. The temper
ature dependence of the magnetic hyperfine fields at Fe-57 nuclei at t
he tetrahedral (A) and octahedral (B) sites is analyzed by the Neel th
eory of ferrimagnetism. The intersublattice superexchange;interaction
is found to be antiferromagnetic with its strength of J(A-B) = -19.5/k
(B) while intrasublattice superexchange interactions are ferromagnetic
with their strengths of J(A-A) = 3.1k(B) and J(B-B) = 4.4k(B).