First- and second-order phase transition
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L.G. Mamsurova; K.S. Pigalskiy; V.P. Sakun; A.I. Shushin; L.G. Scherbakova
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Article
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1990
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Elsevier Science
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English
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The thermodynamics of a system of oxygen ions ordered along the 04 chains in the Cul-04 basal plane of orthorhombic YBa2Cu$&+x is theoretically studied using a modified mean field approximation. This allows the "intrachain" thermodynamics to be treated exactly, although interchain oxygen-oxygen corr