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Multicritical points and reentrant phenomenon in the BEG model

✍ Scribed by Carla Buzano; Alessandro Pelizzola

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 534 KB
Volume: 189
Category: Article
ISSN: 0378-4371
DOI: 10.1016/0378-4371(92)90141-c

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✦ Synopsis

The Blume-Emery-Griffiths model is investigated by use of the cluster variation method in the pair approximation. We determine the regions of the phase space where the reentrant phenomenon takes place. Two regions are found, depending on the sign of the reduced quadrupole-quadrupole coupling strength ~:. For negative ~ we find para-ferro-para and ferro-para-ferro-para transition sequences; for positive ~, a para -ferro-para+ sequence. Order parameters, correlation functions and specific heat are given in some typical cases. By-products of this work are the equations for the critical and tricritical lines.

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