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In this work we revisit the vortex matter phase diagram in layeredsuperconductors solving still open questions by means of AC and DC localmagnetic measurements in the paradigmatic Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8}$compound. We show that measuring with AC magnetic techniques is mandatory inorder to probe the bulk response of vortex matter, particularly athigh-temperatures where surface barriers for vortex entrance dominate. From the$T_{\rm FOT}$-evolution of the enthalpy and latent-heat at the transition wefind that, contrary to previous reports, the nature of the dominant interlayercoupling is electromagnetic in the whole temperature range. By studying thedynamic properties of the phase located at $T \gtrsim T_{\rm FOT}$, we revealthe spanning in a considerable fraction of the phase diagram of a non-linearvortex phase suggesting bulk pinning might play a role even in the liquidvortex phase.

Latent-heat and non-linear vortex liquid at the vicinity of the first-order phase transition in layered high-Tc superconductors