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A scanning Hall probe was used to carry out direct local measurements of the characteristics of a mixed state induced by a magnetic field of a small ferromagnetic particle in thin film YBaCuO samples. The results showed evidence for an extremely low energy barrier for entry of vortex half-loops into high quality films. It was also observed that the half-loops further broke down into vortex-antivortex pairs which was consistent with the Josephson medium model.

In this paper we focus on the comparison of the equilibrium and transport properties of singular and nonsingular vortex structures in high-temperature compounds. Using the time-dependent Ginzburg-Landau theory we study the dynamics of vortex structures in superconductors with (d + s)-wave pairing. We calculate the angular dependent correction to the viscosity tensor of a singular flux line, which appears due to the admixture of subdominant s-wave order parameter component in the vortex core. The second order phase transition between singular and nonsingular vortices in high-temperature superconductors was simulated within the time-dependent Ginzburg-Landau equations. The semiclassical analysis of the positions of gap nodes in the vortex core is performed both for singular and nonsingular flux lines. [ABSTRACT FROM AUTHOR]

Examines the electronic structure and the phase-coherent transport properties of mesoscopic superconductor systems. Possibility of controlling the phase-coherent transport; Function of the quasiparticle excitations in the vortices; Impact of the multiple Andreev reflections on the transmission coefficient.