The Ginzburg-Landau theory in application

A numerical approach to Ginzburg-Landau (GL) theory is demonstrated and we review its applications to several examples of current interest in the research on superconductivity. This analysis also shows the applicability of the two-dimensional approach to thin superconductors and the re-defined effective GL parameter kappa. For two-gap superconductors, the conveniently written GL equations directly show that the magnetic behavior of the sample depends not just on the GL parameter of two bands, but also on the ratio of respective coherence lengths.Comment: To be published in Physica C, VORTEX VI Conference Proceeding

Features of the new breed of sheep in serbia called mis sheep 1. reproductive characteristics and body development

This paper presents the results of reproductive characteristics and body development of the new breed of sheep in Serbia, called Mis sheep. Mis sheep as a type of sheep for meat, had been developed for the past 20 years at the Institute of Animal Husbandry, Belgrade-Zemun. Main method of development is complex combinatory three-breed crossing. As material, three breeds of sheep have been used in this project, namely: Pirot Pramenka, Merinolandschaf and Ile de France. Mis sheep is characterized by a strong constitution with emphasized carcass conformation and excellent meat traits. These are very persistent long-lived animals, well adjusted to conditions of the environment. Mis sheep are white without any spots. Sexual maturity is acquired at the age of 6-8 months, what includes them into the population of early maturing sheep. However, as well as in the case with other noble breeds their first fertilization should be at the age of 10 to 12 months. Mis sheep could be considered as sheep of higher fertility because from 100 sheep giving birth approximately 150 lambs are obtained. At the age of 90 days, the body weight of lambs is approximately 34.26 kg. At the age of 18 months, when sheep are already mature but not completely developed, the body weight is 71.63 kg. Finally, at the age over of 3 years, when they are completely developed, the average weight is 78.89 kg. The body weight of rams varies from 120-140 kg, although even in this case it depends on the production phase and use of male heads in breeding

Superconducting Wigner Vortex Molecule near a Magnetic Disk

Within the non-linear Ginzburg-Landau (GL) theory, we investigate the vortex structure in a superconducting thin film with a ferromagnetic disk on top of it. Antivortices are stabilized in shells around a central core of vortices (or a giant-vortex) with size-magnetization controlled ``magic numbers''. An equilibrium vortex phase diagram is constructed. The transition between the different vortex phases occurs through the creation of a vortex-antivortex pair under the magnetic disk edge.Comment: 4 pages, 4 figures. Submitted to Phys. Rev. Let

Evolution of lattice, spin, and charge properties across the phase diagram of FeSe1-x Sx

A Raman scattering study covering the entire substitution range of the FeSe1-xSx solid solution is presented. Data were taken as a function of sulfur concentration x for 0≤x≤1, of temperature and of scattering symmetry. All types of excitations including phonons, spins, and charges are analyzed in detail. It is observed that the energy and width of the iron-related B1g phonon mode vary continuously across the entire range of sulfur substitution. The A1g chalcogenide mode disappears above x=0.23 and reappears at a much higher energy for x=0.69. In a similar way the spectral features appearing at finite doping in A1g symmetry vary discontinuously. The magnetic excitation centered at approximately 500 cm-1 disappears above x=0.23 where the A1g lattice excitations exhibit a discontinuous change in energy. The low-energy mode associated with fluctuations displays maximal intensity at the nematostructural transition and thus tracks the phase boundary

Three-dimensional ferromagnetic architectures with multiple metastable states

We demonstrate controllable dual-bath electrodeposition of nickel on architecture-tunable three-dimensiona

Dynamic and static phases of vortices under an applied drive in a superconducting stripe with an array of weak links

Static and dynamic properties of superconducting vortices in a superconducting stripe with a periodic array of weakly-superconducting (or normal metal) regions are studied in the presence of external magnetic and electric fields. The time-dependent Ginzburg-Landau theory is used to describe the electronic transport, where the anisotropy is included through the spatially-dependent critical temperature Tc. Superconducting vortices penetrating into the weak-superconducting region with smaller Tc are more mobile than the ones in the strong superconducting regions. We observe periodic entrance and exit of vortices which reside in the weak link for some short interval. The mobility of the weakly-pinned vortices can be reduced by increasing the uniform applied magnetic field leading to distinct features in the voltage vs. magnetic field response of the system