The effect of defect potential on the melting temperature of the vortex lat
tice in a layered HTSC is investigated. It is found that an increase in the
value of the defect potential leads to a shifting of the phase transition
point to the critical temperature, thus increasing considerably the range o
f the intermediate phase "rotating lattice." (C) 1999 American Institute of
Physics. [S1063-777X(99)00310-2].