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

Thorsten Emig·Thomas Nattermann
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Abstract

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/πa 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 μ=p^2/p_c^2-1 and ε=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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Thorsten Emig, Thomas Nattermann. 1998-01-21. A New Disorder Driven Roughening Transition of CDW's and Flux Line Lattices. https://doi.org/10.1103/physrevlett.79.5090

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