Squaric acid?A realization of the Baxter model?

descriptionPublicationkeyboard_double_arrow_right Article 01 Mar 1981 English Publisher:Springer Science and Business Media LLCJournal:Zeitschrift f�r Physik B Condensed Matter, volume 45, pages 177-177 (issn: 0340-224X, eissn: 1434-6036,

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Authors: Uwe Deininghaus;

doi: 10.1007/bf01293333 , 10.1007/bf01294278

Squaric acid?A realization of the Baxter model?

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Abstract

Squaric acid is a layered structure with an antiferrodistortive phase transition atTc =373 K. Vertex and Ising models are considered, leading to the conclusion that two-dimensional squaric acid is a realization of the2d X−Y model with a cubic anisotropy, belonging to the same universality class as the Baxter or symmetrical Ashkin-Teller model. Experimental evidence is briefly discussed.

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