Calculation of the out-of-plane dynamical correlation for two-dimensional magnetic systems |
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Authors: | S L Menezes M E Gouvêa A S T Pires |
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Institution: | (1) Departamento de Física, Universidade Federal de Minas Gerais, 30.161 Belo Horizonte, MG, Brasil |
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Abstract: | The out-of-plane dynamical correlation functionsS
zz
(q, ) for two-dimensional easy-plane ferro- and antiferromagnets are calculated using a diagrammatic expansion for the temperature dependent Green function. Vortex-magnon interference effects on the multimagnon and vortex contribution toS
zz
(q, ) are also analised, in a classical context, for ferromagnets. Our calculations show that we cannot expect multimagnon processes to contribute to a central peak ( =0) that has been observed in these systems for temperaturesT>T
c
, whereT
c
is the temperature at which a topological phase transition is predicted to occur. However, vortex-magnon interactions considerably reduce the intensity of the vortex induced central peak. |
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Keywords: | |
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