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We study the competition between pinning of a charge density wave (CDW) byrandom distributed impurities and a periodic potential of the underlyingcrystal lattice. In d=3 dimensions, we find for commensurate phases of orderp>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 withquasi long range order. Critical exponents are calculated in a double expansionin \mu=p^2/p_c^2-1 and \epsilon=4-d and fulfill the scaling relations of randomfield models. Implications for flux line lattices in high temperaturesuperconductors are briefly discussed.Comment: 4 pages, RevTeX, 1 postscript figur

A New Disorder-Driven Roughening Transition of Charge-Density Waves and Flux-Line Lattices