  There exists a dramatic difference in phase structure between charged black
Dp-branes with $p < 5$ and charged black D5 or D6 branes. In [1], we found that
the phase structure of charged black D5 system can be changed qualitatively to
that of charged black Dp with $p < 5$ by adding the delocalized D1 branes but
the similar change does not happen for the charged black D6 system through
adding the delocalized D2 branes (Note that both D1/D5 and D2/D6 belong to the
same type of D(p - 4)/Dp system). Adding the delocalized D4 branes to the black
D6 branes doesn't work, either. In this paper, we consider adding the
delocalized D0 branes, the only remaining lower dimensional branes, to the
black D6 system for this purpose. We find that the delocalized charged black
D0-branes alone share the same phase structure as the charged black D6 branes,
having no van der Waals-Maxwell liquid-gas type. However, when the two are
combined to form D0/D6, the resulting phase diagram finally gets changed
dramatically to the wanted one, containing now the above liquid-gas type. This
change arises from the interaction between D6 and the delocalized D0.
