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Vortex deformation and breaking in superconductors: A microscopic description | | E. Pardo
; J. H. Durrell
; M. G. Blamire
; | | Date: |
8 Jan 2007 | | Subject: | Superconductivity | | Abstract: | 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. | | Source: | arXiv, cond-mat/0701150 | | Services: | Forum | Review | PDF | Favorites | |
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