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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: Using the unrestricted Hartree-Fock approximation and Landau theory, a new phase is identified which has the same structure factor as the former but in which magnetic moments at nearest-neighbor sites are at right angles making electrons acquire a nontrivial phase when circulating a plaquette at strong coupling.
Abstract: Using the unrestricted Hartree-Fock approximation and Landau theory we identify possible phases competing with superconductivity in FeAs layers. We find that close to half-filling the transition from the paramagnet to the magnetically ordered phase is first order, making anharmonicities relevant and leading to a rich phase diagram. Between the already known one-dimensionally modulated magnetic stripe phase and the paramagnet we find a new phase which has the same structure factor as the former but in which magnetic moments at nearest-neighbor sites are at right angles making electrons acquire a nontrivial phase when circulating a plaquette at strong coupling. Another competing phase has magnetic and charge order and may be stabilized by charged impurities.
73 citations
TL;DR: In this article, the implications of a free energy expression for two media in contact are discussed, and exact implicit equations for the critical temperatures of two semi-infinite media are derived for the film of one medium embedded in another, and of a superlattice structure.
73 citations
TL;DR: In this article, a large class of the conclusions of the Landau theory of Fermi liquids may be established within the framework of many-body perturbation theory, and a rather simple general expression for the quasi-particle distribution function of Landau may be given.
Abstract: Using the results of the preceding paper, it is shown that a large class of the conclusions of the Landau theory of Fermi liquids may be established within the framework of many-body perturbation theory. Both equilibrium and transport phenomena are discussed. The theory is also carried out for long-ranged Coulomb forces. Finally, it is shown that a rather simple general expression for the quasi-particle distribution function of Landau may be given.
73 citations
TL;DR: In this paper, the authors used Wilson's approximate renormalization-group recursion formula for a continuous-spin generalization of the three-component Potts model and showed that the model exhibits a first-order phase transition having finite zero-field spontaneous magnetization at the transition point.
Abstract: We report the numerical study, using Wilson's $\ensuremath{\eta}=0$ approximate renormalization-group recursion formula, of a continuous-spin generalization of the three-component Potts model. Previous numerical studies, based on series expansions of the partition function, have indicated strongly that the model has a phase transition of second order. This is in conflict with Landau theory which predicts that the transition be of first order. We find, in agreement with Landau theory, that our model exhibits a first-order phase transition having finite zero-field spontaneous magnetization at the transition point.
73 citations
TL;DR: In this paper, the authors confirm the existence of a first-order quantum phase transition in soft nuclei in the Hf-Hg mass region using experimental data, and explain why the quadrupole moments in Pt isotopes deviate from the O(6) value.
Abstract: Experimental data in the Hf-Hg mass region indicate the presence of a prolate-oblate phase transition. The transition in which $\ensuremath{\gamma}$-soft nuclei exhibit a first-order quantum phase transition in their shape is of the type that was recently proposed on very general grounds using Landau theory. The transition is situated close to the O(6) limit of the interacting boson model which is indeed found empirically in this mass region. Our study also hints at explaining why the quadrupole moments in Pt isotopes deviate from the O(6) value and confirms the recently proposed prolate-oblate phase transition with experimental data.
73 citations