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Spin‐Phonon Interaction beyond the Limit of Spin‐wave Approximation
Author(s) -
Chân Nguyẽñ Ngoc
Publication year - 1988
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19885000604
Subject(s) - physics , spin wave , spin (aerodynamics) , wave vector , phonon , limit (mathematics) , condensed matter physics , energy (signal processing) , quantum mechanics , spectrum (functional analysis) , quantum electrodynamics , mathematics , ferromagnetism , mathematical analysis , thermodynamics
By solving the system of equations for the doubletime Green functions, an expression for the energy spectrum of the spinsystem with the correction due to spin‐phonon interaction is derived. The utilized commutation relations for spin‐operators are more complicated than in the case of the spin‐wave approximation. In the lower temperature region, our expression becomes the one obtained by the spin‐wave approximation. The temperature dependence and the wave‐vector dependence of the broadening of the energy level are evaluated.