  Thermodynamical properties of charged AdS black holes with a global monopole
still remain obscure. In this paper, we investigate the thermodynamics and
phase transition of the black holes in the extended phase space. It is shown
that thermodynamical quantities of the black holes exhibit an interesting
dependence on the internal global monopole, and they perfectly satisfy both the
first law of thermodynamics and Smarr relation. Furthermore, analysis of the
local and the global thermodynamical stability manifests that the charged AdS
black hole undergoes an elegant phase transition at critical point. Of special
interest, critical behaviors of the black holes resemble a Van der Waals
liquid-gas system. Our results not only reveal the effect of a global monopole
on thermodynamics of AdS black holes, but also further support that Van der
Waals-like behavior of the black holes is a universal phenomenon.
