Abstract
Motion of flux lines in YBa 2Cu 3O 7−δ thin films has been studied by means of a direct-flux counting method. A 1/ f type noise was observed in the thermally activated depinning region, providing a possible signature for self-organized critically. The changes in thermally activated depinning and a depinning-transition with temperature suggest that vortex lattice melting occurs in the YBCO thin films.
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