Order-parameter saturation and low-temperature extension of Landau theory View Full Text


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Article Info

DATE

1991-10

AUTHORS

E. K. H. Salje, B. Wruck, H. Thomas

ABSTRACT

The temperature evolution of the structural order parameter in displacive phase transitions with high transition temperatures (e.g. quartz, As2O5, LaAlO3, CaCO3, NaNO3, Pb3(PO4)2 etc.) follows a Landau-type behaviour over large temperature intevals. Below a saturation temperatureTs, however, the order parameter tends to become temperature independent. A quantitative analysis shows the correlationkBTs=ħΩ/4, where Ω is the frequency of the relevant local excitation atTs. A general Landau-type expression for the Gibbs energy is given which includes the effects of order-parameter saturation. More... »

PAGES

399-404

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf01357186

DOI

http://dx.doi.org/10.1007/bf01357186

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1038149979


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