Transverse Depinning and Melting of a Moving Vortex Lattice in Driven Periodic Josephson Junction Arrays

VERONICA I. MARCONI; DANIEL DOMINGUEZ

PHYSICAL REVIEW LETTERS

The American Physical Society

Año: 1999 vol. 82 p. 4922 - 4925

0031-9007

We study the effect of thermal fluctuations in a vortex lattice driven in the periodic pinning ofa Josephson junction array. The phase diagram current (I) vs temperature (T) is studied. Abovethe critical current I_c(T) we find a moving vortex lattice (MVL) with anisotropic Bragg peaks. Forlarge currents I >> I_c(T), there is a melting transition of the MVL at T_M(I). When applying a smalltransverse current to the MVL, there is negligible dissipation at low T. We find an onset of transversevortex motion at a transverse depinning temperature T_{tr}(I) << T_M(I).