Abstract:The spin dynamics of a two dimensional XY ferromagnet are reexamined at low temperatures in the framework of the Mori continued fraction formalism using the Gaussian approximation. In this formalism, the terms on denominators for the Laplace transform of the relaxation function Rt are related to the frequency moments ! n q of the relaxation shape function Rq;!. In the Gaussian approximation scheme, we truncate the continued fraction for Rt on the second stage. Adopting this approximation, we calculated up to t… Show more
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