Spin anisotropy effects on the dimerization of the magnetostrictive quasi-one-dimensional XY model |
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Authors: | Constantino Tsallis Darly M.H. da Silva |
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Affiliation: | Centro Brasileiro de Pesquisas Físicas/CNPq Av. Wenceslau Braz, 71 - 20.000 Rio de Janeiro-RJ- Brazil |
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Abstract: | The one-dimensional first-neighbour spin - magnetostrictive XY model (with crystalline degrees of freedom assumed three- dimensional) with X and Y spin coupling constants presents a quite rich spin-Peierls dimerization phase diagram. In the (low anisotropy) - (low temperature) region we recover previous results (in particular the possibility for a first-order phase transition in the absence of external magnetic field); in the other three regions of the temperature-anisotropy space interesting branches of the phase diagram (including the tricritical line) are exhibited (for the first time as far as we know). |
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