Premium
Localized Magnetic Vibrations of Quadrupole Impurity Strongly Coupled with the Matrix
Author(s) -
Ivanov M. A.,
Mitrofanov V. Ya.,
Fishman V. Ya.
Publication year - 1974
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.2220610204
Subject(s) - impurity , quadrupole , condensed matter physics , excited state , magnetic impurity , atom (system on chip) , antiferromagnetism , physics , hamiltonian (control theory) , magnetic field , atomic physics , degeneracy (biology) , chemistry , quantum mechanics , mathematical optimization , mathematics , computer science , embedded system , bioinformatics , biology
The spectrum of localized magnetic vibrations of an impurity atom situated symmetrically with respect to the magnetic sublattices of an antiferromagnetic crystal is considered. For an arbitrary exchange interaction of the impurity atom with the matrix the effective Hamiltonian of a spin cluster containing the impurity atom and its nearest neighbours is found. The spectrum of the low‐lying excited states for a weakly and strongly coupled impurity has quadrupole character (with Kramers degeneracy) and lies in the spin‐wave zone of the unperturbed crystal. In the case of a weakly coupled impurity the obtained results coincide with the data of exact calculation. The removal of the Kramers degeneracy in an external magnetic field and the angular dependence of the g ‐factor are investigated.