Mössbauer Studies of Superexchange Interaction in Tetragonal CuFe2O4

✍ Scribed by Hang Nam Oak; Kyung Seon Baek; Sam Jin Kim

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 174 KB
• Volume: 208
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/(sici)1521-3951(199807)208:1<249::aid-pssb249>3.0.co;2-b

✦ Synopsis

CuFe 2 O 4 has been studied by Mo È ssbauer spectroscopy and X-ray diffraction. The crystal is found to have a tetragonal spinel structure with the lattice constants a 0 (5.805 AE 0.005) # e and c 0 (8.669 AE 0.005) # e. The iron ions are in ferric Fe 3 states. The temperature dependence of the magnetic hyperfine fields at 57 Fe nuclei at the tetrahedral (A) and octahedral (B) sites is analyzed by the Ne  el theory of ferrimagnetism. The intersublattice superexchange interaction is found to be antiferromagnetic with its strength of J AÀB À19X5k B while intrasublattice superexchange interactions are ferromagnetic with their strengths of J AÀA 3X1k B and J BÀB 4X4k B .