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Single‐Ion Anisotropy and ESR Linewidth in Quasi‐Low‐Dimensional Heisenberg Magnets
Author(s) -
Martynov S. N.
Publication year - 1988
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.2221460229
Subject(s) - laser linewidth , anisotropy , condensed matter physics , physics , ion , magnetic anisotropy , spin (aerodynamics) , heisenberg model , magnet , magnetic field , ferromagnetism , quantum mechanics , magnetization , thermodynamics , laser
On the basis of the Kubo and Tomita theory the influence of single‐ion anisotropy on the ESR linewidth in a low‐dimensional Heisenberg magnet is estimated in the high‐temperature limit. Two spin correlation functions in r ‐representation are used. The variation of the linewidth Δ( K ) depends on the sign of anisotropy K , the value of spin S , and the magnetic dimension of system d . The linewidth can decrease only to a limited value, equal at S , Δ( K ) = Δ(0) · (2/5) (d+1)/3 .