A New Disorder Driven Roughening Transition of CDW's and Flux Line Lattices

Details A New Disorder Driven Roughening Transition of CDW's and Flux Line Lattices A New Disorder Driven Roughening Transition of CDW's and Flux Line Lattices

1997-08-15

arxiv.org/abs/cond-mat/9708116v2

Phys. Rev. Lett. 79, 5090 (1997)

Physics

Condensed Matter

Statistical Mechanics

4 pages, RevTeX, 1 postscript figure

Scientific paper

10.1103/PhysRevLett.79.5090

We study the competition between pinning of a charge density wave (CDW) by random distributed impurities and a periodic potential of the underlying crystal lattice. In d=3 dimensions, we find for commensurate phases of order p>p_c\approx 6/\pi a disorder driven continuous roughening transition from a 'flat' phase with translational long range order to a 'rough' glassy phase with quasi long range order. Critical exponents are calculated in a double expansion in \mu=p^2/p_c^2-1 and \epsilon=4-d and fulfill the scaling relations of random field models. Implications for flux line lattices in high temperature superconductors are briefly discussed.

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