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Model for local moments in a spin density wave host
Author(s) -
Moyer C. A.,
Kelly J. R.,
Arajs S.
Publication year - 1979
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.2220960234
Subject(s) - condensed matter physics , spin polarization , antiferromagnetism , physics , electron , spin wave , spins , spinplasmonics , rkky interaction , spin (aerodynamics) , zero field splitting , ferromagnetism , quantum mechanics , thermodynamics
An effective spin Hamiltonian is obtained for a system of impurity spins embedded in an itinerant electron antiferromagnetic matrix. Each spin couples to the polarization field of the spin density wave (SDW) via a d–d exchange interaction with the conduction electrons. The impurity spins also interact among themselves via modulation of the conduction electron spin polarization. Using the two‐band model for antiferromagnetism in chromium, it is possible to obtain closed forms analogous to the RKKY result for the spin–spin and spin–matrix interactions. A general effect of SDW formation is to reduce the spin–spin coupling strength, since some conduction electrons are “tied up” in the SDW and are no longer free to mediate the interaction. The SDW is also responsible for the appearance of an antisymmetric interaction which favors canted spin arrangements.