Vortex Lattice Melting into Disentangled Liquid Followed by the 3D-2D Decoupling Transition in YBa2Cu4O8 Single Crystals
Abstract
A sharp resistance drop associated with vortex lattice melting was observed in high quality YBa2Cu4O8 single crystals. The melting line is well described well by the anisotropic GL theory. Two thermally activated flux flow regions, which were separated by a crossover line Bcr=1406.5(1-T/Tc)/T (Tc=79.0 K, Bcr in T), were observed in the vortex liquid phase. Activation energy for each region was obtained and the corresponding dissipation mechanism was discussed. Our results suggest that the vortex lattice in YBa2Cu4O8 single crystal melts into disentangled liquid, which then undergoes a 3D-2D decoupling transition.
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