  The concept of the transition of type II superconductor into the Abrikosov
state as the appearance of long-range phase coherence is considered. It is
shown that this transition should be first order in ideal (without disorder)
superconductor. Such transition is indeed observed in bulk superconductors with
weak disorder at a field Hc4 < Hc2. No experimental evidence of the vortex
lattice melting exists now. It is shown that this popular concept has appeared
on a consequence of an incorrect interpretation of the Abrikosov state and
incorrect definition of the phase coherence. The absence of a sharp transition
in thin films with weak disorder is interpreted as absence of long-range phase
coherence down to very low magnetic field. In order to explain the observed
smooth phase coherence appearance in superconductors with strong disorder it is
proposed to return to the Mendelssohn model.
