Weak point disorder in strongly fluctuating flux-line liquids |
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Authors: | Panayotis Benetatos M Cristina Marchetti |
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Institution: | (1) Hahn-Meitner-Institut, Abteilung Theoretische Physik (SF5), Glienicker Str. 100, D-14109 Berlin, Germany;(2) Physics Department, Syracuse University, 13244 NY, Syracuse, USA |
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Abstract: | 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 ofrelativistic charged bosons in 2 + 1 dimensions P Benetatos and M C Marchetti,Phys. Rev.
B64, 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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Keywords: | Superconductivity flux-line liquids quenched disorder point defects rela-tivistic bosons |
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