Abstract
The mechanism of the flux-line-lattice (FLL) melting in anisotropic high-Tcsuperconductors inB ‖ ĉis clarified by Monte Carlo simulations of the 3D frustrated XY model. The percentage of entangled flux lines abruptly changes at the melting temperature Tm, while no sharp change can be found in the number and size distribution of vortex loops around Tm. Therefore, the origin of this melting transition is the entanglement of flux lines. Scaling behaviors of the melting temperature Tmare consistent with this one-dimensional character of the entanglement mechanism of the FLL melting. That is, Tmdoes not depend on the system size in the ab plane, while it is scaled by the system size along the c axis, Lc, as Tm(Lc) − Tm(∞) ∝ Lc-d, d = 1.
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