10 research outputs found
On Electric Fields in Low Temperature Superconductors
The manifestly Lorentz covariant Landau-Ginzburg equations coupled to
Maxwell's equations are considered as a possible framework for the effective
description of the interactions between low temperature superconductors and
magnetic as well as electric fields. A specific experimental set-up, involving
a nanoscopic superconductor and only static applied fields whose geometry is
crucial however, is described, which should allow to confirm or invalidate the
covariant model through the determination of the temperature dependency of the
critical magnetic-electric field phase diagram and the identification of some
distinctive features it should display.Comment: 14 pages (Latex) + 2 postscript figure
Annular Vortex Solutions to the Landau-Ginzburg Equations in Mesoscopic Superconductors
New vortex solutions to the Landau-Ginzburg equations are described. These
configurations, which extend the well known Abrikosov and giant magnetic vortex
ones, consist of a succession of ring-like supercurrent vortices organised in a
concentric pattern, possibly bound to a giant magnetic vortex then lying at
their center. The dynamical and thermodynamic stability of these annular
vortices is an important open issue on which hinges the direct experimental
observation of such configurations. Nevertheless, annular vortices should
affect indirectly specific dynamic properties of mesoscopic superconducting
devices amenable to physical observation.Comment: 12 pages, LaTeX, 2 Postscript figure
Nanoscopic superconducting slab in static electric and magnetic fields
A space-time covariant extension of the stationary London and Ginzburg-Landau equations is proposed, which naturally entails the coupling of low temperatures superconductors to both electric as well as Magnetic fields. A specific experimental set-up consisting of a slab of nanoscopic thickness submitted to crossed electric and magnetic fields with a specific geometry should allow the confirmation or invalidation of the model. Theoretical considerations and the results of numerical simulations as well as progress towards an actual measuring device are discussed. (C) 2001 Published by Elsevier Science B.V
Vortex matter in lead nanowires
Theoretical and experimental magnetizations of lead nanowire arrays well below the superconducting transition temperature T-c are described. The magnetic response of the array was investigated with a SQUID magnetometer. Hysteretic behaviour and phase transitions have been observed in sweeping up and down the external magnetic field at different temperatures. The Meissner and Abrikosov states were also experimentally observed in this apparently type-I superconductor. This fact brings to the fore the non-trivial behaviour of the critical boundary K-c (= 1/root2 in bulk materials) between type-I and type-II phase transitions at mesoscopic scales. The time-independent Ginzburg-Landau equations particularized to cylindrically symmetric configurations enable one to explain and reproduce the experimental magnetization curves within 10% of error
Temperature dependence of penetration and coherence lengths in lead nanowires
Magnetization curves well below T-c of a lead nanowire array electrodeposited under pulsed voltage conditions are considered. Numerical simulations based on a two-dimensional resolution (2D model) of the Ginzburg-Landau (GL) equations for cylindrical configurations have also been developed. By freely adjusting the GL phenomenological lengths lambda(T) and epsilon(T), the experimental magnetization curves are reproduced to within a 10% error margin. The 2D model also allows us to check the cylindrical symmetry of the obtained configurations. Beyond the experimental-theoretical agreement, the question of whether the GL model remains valid far below T-c is also addressed. The temperature dependence of the adjusted characteristic lengths is compared with different theoretical and empirical laws. The most satisfactory agreement is achieved for the Gorter-Casimir two-fluid model. A comparison with a lead nanowire array electrodeposited under constant voltage conditions allows us to distinguish both samples in terms of their electronic mean free paths. The characterization of the latter quantities concurs perfectly with the experimental expectation given the different electrodeposition techniques
Ring-like vortex solutions to the Landau-Ginzburg equations in superconducting mesoscopic devices
Beyond the well-known Abrikosov and giant vortex configurations, we describe new types of solutions to the Landau-Ginzburg (LG) equations for low temperature superconductivity. These solutions correspond to ring-like current vortices surrounding one another in concentric patterns, which in addition may possibly be bound to a standard L fluxoid configuration in their center. These solutions are possible in mesoscopic devices, due to their finite spatial extent, and generalize the usual vortex configurations for large enough samples. They contribute additional states at a given applied magnetic field, whose metastability still needs to be assessed. Such configurations could add to the richness of the phase transition behavior of mesoscopic superconducting disks and annuli in external magnetic fields, in ways to be explored. The properties and characterization of these new configurations are described, both for mesoscopic disks and annuli. (C) 2000 Elsevier Science B.V. All rights reserved
Superconducting properties of lead nanowires arrays
Mesoscopic superconducting lead nanowires with high aspect ratio and diameter ranging from 40 to 270 nm have been grown by electrodeposition inside nanoporous polycarbonate membranes. Nanowires with a diameter less than 50 nm were insulators due to a poor crystal structure. The others are shown to be type II superconductors because of their small electronic mean free path, instead of being type I which is usual for the bulk form of lead. An increase in the thermodynamic critical field H-c is observed and is attributed to the small transversal dimension leading to an incomplete Meissner effect. Finally, it is demonstrated that this enhancement agrees with numerical simulations based on the Ginzburg-Landau theory. (C) 2002 Elsevier Science B.V. All rights reserved
Vortex configurations in mesoscopic superconducting nanowires
Beyond the well-known Abrikosov and giant vortex configurations, new solutions to the Ginzburg-Landau model corresponding to vortices of integer and half-integer winding number are described. Phase diagrams (B-ext, Energy) and magnetization curves have been determined, aiming towards an understanding of the magnetic properties of lead nanowires and the possible consequences of such solutions with respect to the switching mechanism between vortex states in mesoscopic superconductors