The classical two-dimensional XY model with in-plane magnetic field
1990; IOP Publishing; Volume: 2; Issue: 7 Linguagem: Inglês
10.1088/0953-8984/2/7/016
ISSN1361-648X
AutoresM. E. Gouvêa, Franz G. Mertens, A. R. Bishop, G. M. Wysin,
Tópico(s)Magnetism in coordination complexes
ResumoThe 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 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.
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