Abstract
The vortex matter phase diagram in Bi 2Sr 2CaCu 2O 8+ y is studied by the magnetization measurements and by Josephson plasma resonance. Above the first-order transition (FOT), sample-moving magnetization measurements show an anomaly suggesting the surface-barrier related transition ( T x line). We find a strong change in the interlayer phase coherence at the FOT and the second peak lines, indicating the decoupling nature of these lines. However, we find no anomaly in the interlayer phase coherence at the T x line. These results rule out the existence of the vortex line liquid state.
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