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A study of spin‐phonon interactions in ferromagnetic insulators. II. The phonon spectrum and spin‐lattice relaxation bate
Author(s) -
Jones M. J.,
Cottam M. G.
Publication year - 1975
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.2220670105
Subject(s) - phonon , condensed matter physics , formalism (music) , physics , ferromagnetism , heisenberg model , art , musical , visual arts
The formalism of a previous paper is employed to evaluate the renormalised energy and damping of phonon excitations due to spin–phonon interactions in a Heisenberg ferro‐magnet. The calculations make use of a field theoretical perturbation technique and an expansion in powers of the high density parameter 1/z. The results are applicable over a wide range of temperatures below T c . Calculations are also presented for the spin‐lattice relaxation rate, which can be closely related to the phonon damping.