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Dynamic Behaviour of the s‐d Model
Author(s) -
Wesselinowa Julia M.
Publication year - 1983
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.2221200215
Subject(s) - chalcogenide , condensed matter physics , curie temperature , ferromagnetism , physics , function (biology) , mode (computer interface) , spectrum (functional analysis) , spin wave , spin (aerodynamics) , point (geometry) , quantum electrodynamics , quantum mechanics , mathematics , thermodynamics , geometry , computer science , biology , operating system , optoelectronics , evolutionary biology
A Green function technique is developed to study the excitations and the damping of the excitations of the s‐d interaction model below T c . The spectrum of the magnetic excitations is obtained, which consists of an acoustic and of an optical spin‐wave branch. The E + mode is overdamped near Curie point T c , while it is nearly undamped at low temperatures. The electronic damping is also discussed. Some numerical calculations of various effects are given, using parameters appropriate to the ferromagnetic chalcogenide spinels (such as CdCr 2 S 4 ).