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Landau theory
About: Landau theory is a research topic. Over the lifetime, 2882 publications have been published within this topic receiving 57078 citations.
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TL;DR: In this article, the second-order phase transition between spherical and deformed shapes of atomic nuclei is shown to be an isolated point following from the Landau theory of phase transitions, and the analog of the specific heat at the phase transition is studied.
Abstract: We show that the second-order phase transition between spherical and deformed shapes of atomic nuclei is an isolated point following from the Landau theory of phase transitions. This point can only occur at the junction of two or more first-order phase transitions which explains why it is associated with one special type of structure and requires the recently proposed first-order phase transition between prolate and oblate nuclear shapes. We study then the analog of the specific heat at the phase transition.
15 citations
TL;DR: In this article, the magnetization results obtained for a single crystal of U 3 As 4 along the easy and hard axes, in static external fields up to 20.5 T at various temperatures.
15 citations
TL;DR: In this article, the authors proposed a displacement mechanism for the high-pressure structural transition in the elements of group IVa and analyzed it in the framework of the Landau theory of phase transitions.
Abstract: Displacive mechanisms are proposed for the high-pressure structural transitions which take place in the elements of group IVa. The mechanisms are analysed in the framework of the Landau theory of phase transitions. In carbon the polymorphs are shown to correspond to limit states resulting from critical fractional displacements and critical strains, the corresponding order parameters being defined as periodic functions of the displacements. In Si, Ge, Sn and Pb a number of unifying features are discussed in connection with the electronic structures of these elements.
15 citations
TL;DR: In this paper, a simplifying criterion based on singularity theory is proposed for phase transitions in the Lie-Poincare theory of phase transitions. But when one considers a range of values, in particular near a phase transition, the criterion has to be accordingly partially modified, as we discuss.
15 citations
TL;DR: In this article, a correlation between the stability of blue phases and the physical parameters of liquid-crystal hosts is reported, and the results give clues to develop more suitable blue-phase materials for fundamental researches or fast photonic devices.
Abstract: Correlations between the stability of blue phases and the physical parameters of liquid-crystal hosts are reported in this study. Experimental results show that liquid-crystal blue phases are more thermostabilized when the dielectric anisotropy is reduced or the elastic constants increased. These correlations can be explained by Defect theory and Landau theory for blue phases. Moreover, the results give us the clues to develop more suitable blue-phase materials for fundamental researches or fast photonic devices.
14 citations