Vortex Pinning and Dynamics in HTS films: Role of Extended Linear Defects

2011 ◽  
Vol 1367 ◽  
Author(s):  
Alexander L. Kasatkin ◽  
Constantin G. Tretiatchenko ◽  
Volodymyr M. Pan
Keyword(s):  
Lorentz Force ◽  
Classical Mechanics ◽  
Vortex Pinning ◽  
Dislocation Model ◽  
Linear Defect ◽  
Single Vortex ◽  
Linear Defects ◽  
Anisotropic Superconductor ◽  
Hts Films

ABSTRACTThe model of single vortex escape from extended linear defect and subsequent vortex dynamics under the Lorentz force action in a rather thick (d > 2λ) 3D anisotropic superconductor is developed. We consider the case of parallel c-oriented linear defects as well as the case of equidistant linear row of such kind of defects, which represents the dislocation model of low-angle [001] tilt grain boundary in HTS films and bicrystals. The suggested model based on the classical mechanics approach allows to describe behavior of an elastic vortex string in the potential well of linear defect and under the action of Lorentz force on its end within the Meissner current carrying layer and to determine the depinning critical current density at low magnetic fields and temperatures.

Oscillating modes of a massive single vortex line in an anisotropic superconductor: The role of temperature

2013 ◽  
Vol 39 (2) ◽  
pp. 102-106 ◽  
Author(s):  
S. V. Vasiliev ◽  
V. V. Chabanenko ◽  
N. V. Kuzovoi ◽  
V. F. Rusakov
Keyword(s):  
Vortex Line ◽  
Single Vortex ◽  
Anisotropic Superconductor

Epitaxial YBa2Cu3O7-8 films : Crucial role of growth-induced linear defects in microwave properties

2001 ◽  
Vol 11 (PR11) ◽  
pp. Pr11-47-Pr11-52
Author(s):  
V. M. Pan ◽  
V. S. Flis ◽  
V. A. Komashko ◽  
O. G. Plys ◽  
C. G. Tretiatchenko ◽  
...  
Keyword(s):  
Crucial Role ◽  
Microwave Properties ◽  
Linear Defects

Subsequent and Subsidiary? Rethinking the Role of Applications in Establishing Quantum Mechanics

2015 ◽  
Vol 45 (5) ◽  
pp. 641-702 ◽  
Author(s):  
Jeremiah James ◽  
Christian Joas
Keyword(s):  
Molecular Structure ◽  
Quantum Mechanics ◽  
Quantum Theory ◽  
Classical Mechanics ◽  
Theory Construction ◽  
Science Pedagogy ◽  
Old Quantum Theory ◽  
The Common ◽  
Complete Quantum

As part of an attempt to establish a new understanding of the earliest applications of quantum mechanics and their importance to the overall development of quantum theory, this paper reexamines the role of research on molecular structure in the transition from the so-called old quantum theory to quantum mechanics and in the two years immediately following this shift (1926–1928). We argue on two bases against the common tendency to marginalize the contribution of these researches. First, because these applications addressed issues of longstanding interest to physicists, which they hoped, if not expected, a complete quantum theory to address, and for which they had already developed methods under the old quantum theory that would remain valid under the new mechanics. Second, because generating these applications was one of, if not the, principal means by which physicists clarified the unity, generality, and physical meaning of quantum mechanics, thereby reworking the theory into its now commonly recognized form, as well as developing an understanding of the kinds of predictions it generated and the ways in which these differed from those of the earlier classical mechanics. More broadly, we hope with this article to provide a new viewpoint on the importance of problem solving to scientific research and theory construction, one that might complement recent work on its role in science pedagogy.

Simulation of thermal behavior of nanoparticles due to appearance of MHD

2021 ◽  
pp. 2150141
Author(s):  
Yahya Ali Rothan
Keyword(s):  
Porous Media ◽  
Thermal Behavior ◽  
Lorentz Force ◽  
Source Terms ◽  
Hybrid Nanomaterial ◽  
Accuracy Increase

To illustrate the role of Lorentz force on migration of nanopowders, CVFEM simulation has been reported in current research. The chamber contains hybrid nanomaterial and made up form porous media. Momentum equations have been modified for present paper with adding new source terms. The mentioned method works based on FEM in generation of mesh and calculation of gradient of scalars while it uses FVM approach for employing source terms. Testing with benchmark article shows the nice accuracy. Increase of permeability can enhance the speed of nanopowders and iso-temperature lines shapes become complicated. Impose of MHD creates new force against buoyancy and declines the velocity of the nanomaterial. Also, complication of isotherms declines with rise of Ha. With growth of Da, value of [Formula: see text] increases about 111% and 64.2% when [Formula: see text] and 20, respectively. Also, augment of Ha results in reduction of velocity about 30% and 47.6% when [Formula: see text] and 100. Given [Formula: see text], Nu for [Formula: see text] is 6.83 times bigger than case with [Formula: see text]. Nu decreases to about 67.28% with increase of Ha when [Formula: see text], [Formula: see text]. As Da increases, Nu rises about 62% when [Formula: see text], [Formula: see text].

Invariance Groups in Classical and Quantum Mechanics

1973 ◽  
Vol 28 (3-4) ◽  
pp. 538-540 ◽  
Author(s):  
D. J. Simms
Keyword(s):  
Quantum Mechanics ◽  
Phase Space ◽  
Energy Levels ◽  
Classical Mechanics ◽  
Symmetry Groups ◽  
Casimir Invariants ◽  
Classical Phase Space ◽  
Invariance Groups ◽  
Classical And Quantum Mechanics

AbstractThis is a report on some new relations and analogies between classical mechanics and quantum mechanics which arise out of the work of Kostant and Souriau. Topics treated are i) the role of symmetry groups; ii) the notion of elementary system and the role of Casimir invariants; iii) energy levels; iv) quantisation in terms of geometric data on the classical phase space. Some applications are described.

Observation of single-vortex pinning in superfluid 4He

1998 ◽  
Vol 255 (1-4) ◽  
pp. 55-74 ◽  
Author(s):  
E. Varoquaux ◽  
O. Avenel ◽  
P. Hakonen ◽  
Yu. Mukharsky
Keyword(s):  
Vortex Pinning ◽  
Superfluid 4He ◽  
Single Vortex

Role of twin boundaries on vortex pinning of CSD YBCO nanocomposites

2014 ◽  
Vol 27 (12) ◽  
pp. 125009 ◽  
Author(s):  
V Rouco ◽  
A Palau ◽  
R Guzman ◽  
J Gazquez ◽  
M Coll ◽  
...  
Keyword(s):  
Vortex Pinning ◽  
Twin Boundaries

scholarly journals Koopman wavefunctions and Clebsch variables in Vlasov–Maxwell kinetic theory

2021 ◽  
Vol 87 (4) ◽  
Author(s):  
Cesare Tronci ◽  
Ilon Joseph
Keyword(s):  
Kinetic Theory ◽  
Classical Mechanics ◽  
Canonical Formalism ◽  
Canonical Structure ◽  
Hamiltonian Structures ◽  
Von Neumann ◽  
Gauge Transformations ◽  
Phase Dynamics ◽  
Space Formulation

Motivated by recent discussions on the possible role of quantum computation in plasma simulations, here, we present different approaches to Koopman's Hilbert-space formulation of classical mechanics in the context of Vlasov–Maxwell kinetic theory. The celebrated Koopman–von Neumann construction is provided with two different Hamiltonian structures: one is canonical and recovers the usual Clebsch representation of the Vlasov density, the other is non-canonical and appears to overcome certain issues emerging in the canonical formalism. Furthermore, the canonical structure is restored for a variant of the Koopman–von Neumann construction that carries a different phase dynamics. Going back to van Hove's prequantum theory, the corresponding Koopman–van Hove equation provides an alternative Clebsch representation which is then coupled to the electromagnetic fields. Finally, the role of gauge transformations in the new context is discussed in detail.

scholarly journals Vortex pinning in the superfluid core of relativistic neutron stars

2021 ◽  
Vol 503 (1) ◽  
pp. 1407-1417
Author(s):  
Aurélien Sourie ◽  
Nicolas Chamel
Keyword(s):  
Neutron Stars ◽  
Outer Core ◽  
Vortex Pinning ◽  
Global Dynamics ◽  
Mutual Friction ◽  
Dynamical Equations ◽  
General Relativistic ◽  
Superfluid Core ◽  
Relativistic Framework

ABSTRACT Our recent Newtonian treatment of the smooth-averaged mutual-friction force acting on the neutron superfluid and locally induced by the pinning of quantized neutron vortices to proton fluxoids in the outer core of superfluid neutron stars is here adapted to the general-relativistic framework. We show how the local non-relativistic motion of individual vortices can be matched to the global dynamics of the star using the fully 4D covariant Newtonian formalism of Carter & Chamel. We derive all the necessary dynamical equations for carrying out realistic simulations of superfluid rotating neutron stars in full general relativity, as required for the interpretation of pulsar frequency glitches. The role of vortex pinning on the global dynamics appears to be non-trivial.

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