Positional order of the disordered Abrikosov flux line lattice in samples of finite thickness

Details Positional order of the disordered Abrikosov flux line lattice in samples of finite thickness Positional order of the disordered Abrikosov flux line lattice in samples of finite thickness

2001-06-16

arxiv.org/abs/cond-mat/0106320v2

Int. J. Mod. Phys. B, Vol. 19, No. 23 (2005) 3575-3601

Physics

Condensed Matter

Superconductivity

Introduction significantly expanded, some typos corrected

Scientific paper

10.1142/S0217979205032334

We study translational correlations of the vortex {\em center of mass} positions of the Abrikosov flux-line lattice in superconducting samples of finite thickness $L$ (along the direction of flux-lines). The Larkin correlation lengths for the center of mass mode of the flux lines in the presence of point and correlated disorder are computed, and we find that in the case of point disorder the average (i.e. center of mass) position of flux lines maintains positional order on length scales which scale like $\sim\sqrt{L}$ in 2+1 dimensions. On still longer length scales, however, we find using a replica Gaussian variational approach that center of mass correlations cross over to a power law growth of the form $r_\perp/L$, which should be observable in superconducting thin films.

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