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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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Journal ArticleDOI
TL;DR: In this paper, the ferroelastic nature of the pressure-induced scheelite-to-fergusonite phase transition in ABO 4 orthotungstates and orthomolybdates has been obtained from the analysis of Raman spectroscopy data.

48 citations

Journal ArticleDOI
TL;DR: In this article, it was shown that fluctuations of intermediate wavelengths are the crucial effect producing non-classical exponent (intermediate wavelengths are much larger than the range of forces, much smaller than the correlation length).

48 citations

Journal ArticleDOI
TL;DR: In this paper, the existence of a generalized solution of the Cauchy problem for Landau's equation was shown to be true for a generalized generalized version of the Landau problem.
Abstract: A PROOF is given of the existence of a generalized solution of the Cauchy problem for Landau's equation.

48 citations

Journal ArticleDOI
TL;DR: In this article, X-ray and neutron diffraction and dielectric measurements were performed for the antiferroelectric phase of PbZrO 3, and the free energy based on a group theoretical method, which includes a quantum effect, was described.
Abstract: X-ray and neutron diffraction and dielectric measurements were performed for the antiferroelectric phase of PbZrO 3 . The antiferroelectric Σ 3 (TO) and the R 25 superlattice-reflection intensities, and the pseudo-tetragonal lattice distortion of the perovskite sublattice showed the same temperature dependence below room temperature, showing a saturation below about 60 K. Above room temperature, however, they showed rather different temperature dependences. These temperature dependences can be well described by the free energy based on a group theoretical method, which includes a quantum effect. The atomic shifts do not necessarily conform to a simple concept of order parameter in soft mode condensation. However the antiferroelectric phase transition can be understood by the phenomenological theory for coupled order parameters if applied over the whole temperature region.

48 citations

Journal ArticleDOI
TL;DR: In this article, the authors show how a theorem of Ducastelle and Cyrot-Lackmann concerning the number of such zeros for the case of a tight-binding band can be extended to quantities expressible in terms of Green functions.
Abstract: Certain physical properties, or differences of two physical quantities, oscillate in sign depending on how far the energy bandstructure is filled. The authors show how a theorem of Ducastelle and Cyrot-Lackmann (1971) concerning the number of such zeros for the case of a tight-binding band can be extended to quantities expressible in terms of Green functions. One application is to the relative ease of formation of different structures or magnetic configurations in transition metals; another application is to the Landau theory of phase transitions. The authors show the relation between the theorem and Friedel oscillations.

48 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202317
202242
202142
202041
201949
201855