Abstract
We first discuss nonlinear aspects of phase transition theory applied to a particular liquid crystal phase transition. A simple derivation is given to show how two coupled Goldstone modes (one appearing as gauge fluctuations of the ordered phase) can force a phase transition, against all expectations, to take place discontinuously (theory of Halperin, Lubensky, and Ma)-but the discontinuity may be immeasurably small. Then, we describe a new dynamical test of phase transition order, developed by Cladiset al., that turns out to be more sensitive than x-ray diffraction and adiabatic calorimetry. Quantitative data found by this new method are in excellent agreement with the measurements of adiabatic calorimetry and x-ray diffraction as well as expectations implicit in the predictions of HLM.
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This is the text of an after-banquet talk given at the CNLS Workshop on the Dynamics of Concentrated Systems.
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Cladis, P.E. A dynamical test of phase transition order: New things in old places or old wine in new bottles. J Stat Phys 62, 899–925 (1991). https://doi.org/10.1007/BF01128168
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DOI: https://doi.org/10.1007/BF01128168