Showing papers by "C. A. Balseiro published in 2000"
TL;DR: In this article, long-term relaxation measurements of the irreversible magnetization in single crystals with columnar defects were presented, and it was shown that double kink excitations occur even in the presence of pinning energy dispersion.
Abstract: We present long-term relaxation measurements of the irreversible magnetization in ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ single crystals with columnar defects Within the single vortex pinning regime we find a nonglassy response at intermediate currents, in between the half loops and superkinks glassy regimes We demonstrate that such behavior is due to double kink excitations whose critical nucleus has a size independent of current, and occur even in the presence of pinning energy dispersion
12 citations
TL;DR: In this article, the external magnetic field lies parallel to the planes in layered superconductors and the experimental results for resistivity are qualitatively consistent with numerical simulations that describe the melting of a commensurate rotated lattice.
Abstract: In this paper we analyze the structure, phase transitions and some transport properties of the vortex system when the external magnetic field lies parallel to the planes in layered superconductors. We show that experimental results for resistivity are qualitatively consistent with numerical simulations that describe the melting of a commensurate rotated lattice. However for some magnetic fields, the structure factor indicates the occurrence of smectic peaks at an intermediate temperature regime.
11 citations
TL;DR: In this article, the solid-liquid transition of a model of pancake vortices in laminar superconductors using a density functional theory of freezing was studied, and the physical properties of the system along the melting line were discussed in detail.
Abstract: We study the solid-liquid transition of a model of pancake vortices in laminar superconductors using a density functional theory of freezing. The physical properties of the system along the melting line are discussed in detail. We show that there is a very good agreement with experimental data in the shape and position of the first order transition in the phase diagram and in the magnitude and temperature dependence of the magnetic induction jump at the transition. We analyze the validity of the Lindemann melting criterion and the Hansen-Verlet freezing criterion. Both criteria are shown to predict well the phase diagram in the region where a first-order phase transition is experimentally observed.
6 citations