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Mean field solution of the general spin Blume-Capel model

We study the mean field solution of the general Blume-Capel model with integer and semi-integer spins. For integer spins there exist one tricritical point and a disordered phase at low temperatures which are not present for semi-integer spins. In both cases we find, at T=0, a multiphase point in whi...

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Bibliographic Details
Published in:Physics letters. A 1993-02, Vol.173 (4), p.360-364
Main Authors: Plascak, J.A., Moreira, J.G., sáBarreto, F.C.
Format: Article
Language:English
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Summary:We study the mean field solution of the general Blume-Capel model with integer and semi-integer spins. For integer spins there exist one tricritical point and a disordered phase at low temperatures which are not present for semi-integer spins. In both cases we find, at T=0, a multiphase point in which the different phases spread out when the temperature is increased. This fact gives origin to first-order transition lines between different ordered phases (characterized by different values of the magnetizations) each one terminating at an isolated critical point.
ISSN:0375-9601
1873-2429
DOI:10.1016/0375-9601(93)90250-4