Weak point disorder in strongly fluctuating flux-line liquids

Details Weak point disorder in strongly fluctuating flux-line liquids Weak point disorder in strongly fluctuating flux-line liquids

2005-04-14

arxiv.org/abs/cond-mat/0504364v1

Pramana-J. Phys. 66, No. 1, pp. 55-65 (2006)

Physics

Condensed Matter

Superconductivity

15 pages, submitted to Pramana-Journal of Physics for the special volume on Vortex State Studies

Scientific paper

10.1007/BF02704937

We consider the effect of weak uncorrelated quenched disorder (point defects) on a strongly fluctuating flux-line liquid. We use a hydrodynamic model which is based on mapping the flux-line system onto a quantum liquid of relativistic charged bosons in 2+1 dimensions [P. Benetatos and M. C. Marchetti, Phys. Rev. B 64, 054518, (2001)]. In this model, flux lines are allowed to be arbitrarily curved and can even form closed loops. Point defects can be scalar or polar. In the latter case, the direction of their dipole moments can be random or correlated. Within the Gaussian approximation of our hydrodynamic model, we calculate disorder-induced corrections to the correlation functions of the flux-line fields and the elastic moduli of the flux-line liquid. We find that scalar disorder enhances loop nucleation, and polar (magnetic) defects decrease the tilt modulus.

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