2004/11/01 by Mauro M. Doria, Antonio R. de C. Romaguera
Physics and Astronomy · #cond-mat.supr-con
published as Brazilian J. Phys. 35(1), 157 - 161, 2005 · Submitted to Braz. Jour. Phys. (http://www.sbfisica.org.br/bjp) 11 pages, 6 figures, 1 table, LaTex 2e
arxiv created 2004/11/01 · arxiv updated 2009/12/01
A vortex line, shaped by a zigzag of pinning centers, is described here through a three-dimensional unit cell containing two pinning centers positioned symmetrically with respect to its center. The unit cell is a cube of side L=12ξ, the pinning centers are insulating spheres of radius R, taken within the range 0.2ξ to 3.0ξ, ξ being the coherence length. We calculate the free energy density of these systems in the framework of the Ginzburg-Landau theory.