Vortex deformation and breaking in superconductors: A microscopic description

Details Vortex deformation and breaking in superconductors: A microscopic description Vortex deformation and breaking in superconductors: A microscopic description

2007-01-08

arxiv.org/abs/cond-mat/0701150v2

Philosophical Magazine, Vol. 87, No. 28, 1st October 2007, 4359-4381

Physics

Condensed Matter

Superconductivity

11 figures in 13 files; minor changes after printing proofs

Scientific paper

10.1080/14786430701531006

Vortex breaking has been traditionally studied for nonuniform critical current densities, although it may also appear due to nonuniform pinning force distributions. In this article we study the case of a high-pinning/low-pinning/high-pinning layered structure. We have developed an elastic model for describing the deformation of a vortex in these systems in the presence of a uniform transport current density $J$ for any arbitrary orientation of the transport current and the magnetic field. If $J$ is above a certain critical value, $J_c$, the vortex breaks and a finite effective resistance appears. Our model can be applied to some experimental configurations where vortex breaking naturally exists. This is the case for YBa$_2$Cu$_3$O$_{7-x}$ (YBCO) low angle grain boundaries and films on vicinal substrates, where the breaking is experienced by Abrikosov-Josephson vortices (AJV) and Josephson string vortices (SV), respectively. With our model, we have experimentally extracted some intrinsic parameters of the AJV and SV, such as the line tension $\epsilon_l$ and compared it to existing predictions based on the vortex structure.

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