M E Gouvea , F G Mertens , A R Bishop and G M Wysin
Theor. Div., Los Alamos Nat. Lab., NM, USA
Journal of Physics: Condensed Matter Create an alert RSS this journal
M E Gouvea et al 1990 J. Phys.: Condens. Matter 2 1853
The authors present analytical and numerical simulation studies on the two-dimensional XY classical ferromagnetic model with weak in-plane magnetic field (the reduced field is h=0.05 and it is applied along the x axis). The structure and dynamics of vortex spin configurations are considered. The simulation data show a strong crossover at Tc approximately=1.0 JS2; the data for T<Tc are well interpreted by one- and two-spin wave processes with an additional anomalous central peak at Sxx(q, omega ) structure function which is suggested as a contribution from domain walls. The data for T>or=Tc can be interpreted by vortex gas theory. The in-plane data can be compared to recent experiments performed on CoCl2-intercalated into graphite. The Szz(q, omega ) shows unusual behaviour as T is increased to T>or=1.2 JS2 indicating that another phase transition or crossover, related to the out-of-plane spin component, can occur.
75.10.Hk Classical spin models
75.60.Ch Domain walls and domain structure
75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
Issue 7 ( 19 February 1990)
M E Gouvea et al 1990 J. Phys.: Condens. Matter 2 1853
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