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Effect of magnon–LA phonon interaction on LA phonon excitation at finite temperature
Author(s) -
Cheng TaiMin,
Li Lin,
Shen Longhai
Publication year - 2008
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.200743285
Subject(s) - phonon , condensed matter physics , brillouin zone , magnon , excitation , physics , ferromagnetism , dispersion (optics) , quantum mechanics
A magnon–longitudinal acoustic (LA) phonon interaction model is developed on the basis of a two‐dimensional square Heisenberg ferromagnetic system. The LA phonon excitation is studied by Matsubara–Green function theory, and the LA phonon excitation dispersion curves are calculated on the main symmetric lines in Brillouin zone (BZ). It is found that there exists obvious LA phonon hardening. The hardening of LA phonons becomes more evident near the M point of the BZ boundary. The influences of various parameters on LA phonon hardening are also discussed. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)