Abstract
We study vortex matter phase diagram of Bi 2Sr 2CaCu 2O 8+ δ , by using Monte Carlo simulation based on Lawrence–Doniach model. Introducing strong point-like disorder, we find two successive phase transformations from the strongly pinned vortex glass to pancake vortex gas via an intermediate weakly pinned glass, when temperature is increased. The first one is identified as an intra-layer depinning transition as pre-melting, which subdivides the glass phase into two phases. The intermediate glass melts with inter-layer decoupling of vortex lines, implying the loss of interlayer long-range coherence. These two-phase boundaries agree with recent experimental data.
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