Theoretical analysis of neutron scattering results for quasi-two dimensional ferromagnets

S. Sarkar (), S.K. Paul and R. Chaudhury

The European Physical Journal B: Condensed Matter and Complex Systems, 2012, vol. 85, issue 11, 1-9

Abstract: A theoretical study has been carried out to analyse the available results from the inelastic neutron scattering experiment performed on a quasi-two dimensional spin- \hbox{$\frac{1}{2}$} 1 2 ferromagnetic material K 2 CuF 4 . Our formalism is based on a conventional semi-classical like treatment involving a model of an ideal gas of vortices/anti-vortices corresponding to an anisotropic XY Heisenberg ferromagnet on a square lattice. The results for dynamical structure functions for our model corresponding to spin- \hbox{$\frac{1}{2}$} 1 2 , show occurence of negative values in a large range of energy transfer even encompassing the experimental range, when convoluted with a realistic spectral window function. This result indicates failure of the conventional theoretical framework to be applicable to the experimental situation corresponding to low spin systems. A full quantum formalism seems essential for treating such systems. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Keywords: Solid State and Materials (search for similar items in EconPapers)
Date: 2012
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DOI: 10.1140/epjb/e2012-30200-6

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