Microscopical Derivation of Ginzburg-Landau-Type Functionals for Alloys and Their Application to Studies of Antiphase and Interphase Boundaries

In this paper we propose a model for determining the pressure loss due to friction in each phase in a three-layer laminar steady flow of immiscible liquid and gas flow in a flat channel. This model generalizes an analogous problem for a two-layer laminar flow, proposed earlier. The relations obtained in the final form for the pressure loss due to friction in liquids can be used as closing relations for the three-fluid model. These equations take into account the influence of interphase boundaries and are an alternative to the approach used in foreign literature. In this approach, the wall and interphase voltages are approximated by the formulas for a single-phase flow and do not take into account the mutual influence of liquids on the loss of pressure on friction in phases. The distribution of flow parameters in these two models is compared.

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Solitonic Charged Pion Crystal in Dense QCD – from a generalized Ginzburg-Landau approach –

EPJ Web of Conferences ◽

10.1051/epjconf/20148000041 ◽

2014 ◽

Vol 80 ◽

pp. 00041 ◽

Cited By ~ 1

Author(s):

Hiroaki Abuki

Keyword(s):

Charged Pion ◽

Ginzburg Landau

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Superconducting Order Parameter Nucleation and Critical Currents in the Presence of Weak Stray Fields in Superconductor/Insulator/Ferromagnet Hybrids

Coatings ◽

10.3390/coatings11050507 ◽

2021 ◽

Vol 11 (5) ◽

pp. 507

Author(s):

Vasiliy N. Kushnir ◽

Serghej L. Prischepa ◽

Michela Trezza ◽

Carla Cirillo ◽

Carmine Attanasio

Keyword(s):

Phenomenological Theory ◽

Critical Currents ◽

Superconducting Phase ◽

Stray Field ◽

Superconducting Properties ◽

Ginzburg Landau ◽

Ferromagnetic Layers ◽

Linearized System ◽

Critical Current Density Jc ◽

Usadel Equations

The stray fields produced by ferromagnetic layers in Superconductor/Insulator/Ferromagnet (S/I/F) heterostructures may strongly influence their superconducting properties. Suitable magnetic configurations can be exploited to manipulate the main parameters of the hybrids. Here, the nucleation of the superconducting phase in an external magnetic field that periodically oscillates along the film width is studied on the base of the numerical solution of the linearized system of Usadel equations. In addition, the effect of the magnetic configuration of the F-layer on the temperature dependence of the critical current density, Jc(T), is investigated in the framework of the Ginzburg–Landau phenomenological theory on the base of the oscillating model of a stray field. By following this approach, the Jc(T) dependence of a Nb/SiO2/PdNi trilayer is reproduced for different magnetic configurations of the PdNi layer.

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