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Exchange splitting of ionic S‐State in MnFe 2 O 4 studied by neutron spectroscopy
Author(s) -
Ligenza S.
Publication year - 1978
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220860225
Subject(s) - spins , inelastic neutron scattering , condensed matter physics , octahedron , spectroscopy , tetrahedron , neutron , zero field splitting , chemistry , atomic physics , neutron scattering , physics , crystallography , spin polarization , crystal structure , electron , quantum mechanics
Inelastic neutron scattering is used to investigate spin interactions in polycrystalline MnFe 2 O 4 . Neutron spectra connected with local spin interaction (not perturbated by cooperative phenomena) are observed and interpreted basing on the 6 S 5/2 ‐term splitting of ions situated in octahedral B‐sites and tetrahedral A‐sites. In the analysis of 6 S 5/2 ‐term splitting the phenomenological spin‐Hamiltonian is used, assuming a magneto‐electric interaction of spins. The transition energy peaks connected with different magnetic coordinations at B‐sites and A‐sites are observed. Defining the interaction between pairs of spins as — 2 J AB S A · S B it is found that J AB / k = (– 20.0 ± 0.7) K, in agreement with the result obtained from magnon dispersion measurements.