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Order-parameter saturation and low-temperature extension of Landau theory

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Zeitschrift für Physik B Condensed Matter

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 temperatureT s , however, the order parameter tends to become temperature independent. A quantitative analysis shows the correlationk B T s =ħΩ/4, where Ω is the frequency of the relevant local excitation atT s . A general Landau-type expression for the Gibbs energy is given which includes the effects of order-parameter saturation.

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Authors and Affiliations

  1. Department of Earth Sciences, University of Cambridge, Downing Street, CB2 3 EQ, Cambridge, UK

    E. K. H. Salje

  2. Department of Earth Sciences, University of Cambridge, Downing Street, CB2 3 EQ, Cambridge, UK

    B. Wruck

  3. Institut für Physik der Universität Basel, Klingelbergstrasses 82, CH-4056, Basel, Switzerland

    H. Thomas

Authors
  1. E. K. H. Salje
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  2. B. Wruck
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  3. H. Thomas
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Salje, E.K.H., Wruck, B. & Thomas, H. Order-parameter saturation and low-temperature extension of Landau theory. Z. Physik B - Condensed Matter 82, 399–404 (1991). https://doi.org/10.1007/BF01357186

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  • DOI: https://doi.org/10.1007/BF01357186

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