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Exchange and spin‐orbit coupling in KFeF 3
Author(s) -
Fatehally R.,
Sastry N. P.,
Nagarajan R.
Publication year - 1968
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.19680260107
Subject(s) - antiferromagnetism , condensed matter physics , hamiltonian (control theory) , physics , magnetization , angular momentum , coupling constant , spectral line , ion , spin–orbit interaction , quantum mechanics , magnetic field , mathematics , mathematical optimization
KFeF 3 , with perovskite structure. is known to be antiferromagnetic below T N = 115°K. The ferrous ion has some unquenched angular momentum, which plays an important role in magnetic ordering. Using a single ion Hamiltonian which includes spin‐orbit and exchange contributions, it is shown that the sublattice magnetization can only be stabilized in one of two possible directions. The Hamiltonian is treated in a self‐consistent way, and shown to be consistent with Mössbauer spectra below T N , and a value of the exchange constant J is obtained. A consideration of this and previous estimates leads to J/k ≈ 7°k.