Topic
Landau theory
About: Landau theory is a research topic. Over the lifetime, 2882 publications have been published within this topic receiving 57078 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: Already within Landau theory with short-ranged substrate-adsorbate forces, complete wetting is not necessary near critical points, but only partial wetting all the way to the critical point, and even critical-point dewetting are possible.
Abstract: Already within Landau theory with short-ranged substrate-adsorbate forces, complete wetting is not necessary near critical points. Preferential adsorption, but only partial wetting all the way to the critical point, and even critical-point dewetting are possible. Physical systems displaying such behavior include uniaxial magnets with triplet surface fields, and special choices of adsorbed liquid-vapor systems, binary mixtures, liquid crystals, and critical-end-point systems.
14 citations
TL;DR: In this article, the properties of binary mixtures with closed-loop diagrams are discussed and the topology of the phase diagram of a binary mixture with hydrogen-bonding is obtained in the mean-field approximation of the lattice mixture Hamiltonian.
14 citations
TL;DR: In this article, the authors reported experiments on the plastic flow of solid and mixture helium crystals and found that the plastic diffusion rate in the mixture was increased by 1.4% and 2.8% near the phase transition.
Abstract: We report experiments on the plastic flow of solid
4
He and
3
He-
4
He mixtures of 1.4% and 2.8% near the
bcc-hcp
transition. Plastic flow was generated by moving a wire through a macroscopic single crystal. We found that the plastic flow rate both in pure
4
He and in mixture helium crystals is enhanced in vicinity of the
bcc-hcp
phase transition. The results are interpreted in terms of self diffusion in the solid. Values of the self diffusion coefficient Ds
at the respective transition temperatures of pure
4
He and of the mixtures are very close, and reach that found in normal liquids. The activation energy for self diffusion in the mixtures is lower by up to 3 K than in pure
4
He. We suggest that similar to what is observed in
bcc
metals, self-diffusion in solid He takes place through phonon assisted atom-vacancy exchange. The enhancement of the diffusion near the
bcc-hcp
transition is a result of the softening of a short wavelength transverse phonon. The temperature dependence of the energy of the phonon calculated using our data is in accord with the Landau theory of a phase transition driven by a soft mode. Work hardening was observed in mixture crystals, but not in pure
4
He. This implies that
3
He impurities pin dislocation lines.
14 citations
TL;DR: The existence of chiral spin waves-collective modes in a two-dimensional Fermi liquid with the Rashba or Dresselhaus spin-orbit coupling is predicted and it is proposed to observe spin-chiral modes via microwave absorption by standing waves confined by an in-plane profile of thespin-orbit splitting.
Abstract: We predict the existence of chiral spin waves-collective modes in a two-dimensional Fermi liquid with the Rashba or Dresselhaus spin-orbit coupling. Starting from the phenomenological Landau theory, we show that the long-wavelength dynamics of magnetization is governed by the Klein-Gordon equations. The standing-wave solutions of these equations describe ''particles" with effective masses, whose magnitudes and signs depend on the strength of the electron-electron interaction. The spectrum of the spin-chiral modes for arbitrary wavelengths is determined from the Dyson equation for the interaction vertex. We propose to observe spin-chiral modes via microwave absorption by standing waves confined by an in-plane profile of the spin-orbit splitting.
14 citations
24 Dec 2007
14 citations