We study the effect of thermal fluctuations in a vortex lattice driven in the periodic pinning of a Josephson junction array. The phase diagram current ( I) vs temperature ( T) is studied. Above the critical current Ic(T) we find a moving vortex lattice (MVL) with anisotropic Bragg peaks. For large currents IIc(T), there is a melting transition of the MVL at TM(I). When applying a small transverse current to the MVL, there is negligible dissipation at low T. We find an onset of transverse vortex motion at a transverse depinning temperature Tₜᵣ(I)<TM(I).
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Marconi et al. (1999) studied this question.
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