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Understanding black hole microstructure via the thermodynamic geometry canprovide us with more deeper insight into black hole thermodynamics in modifiedgravities. In this paper, we study the black hole phase transition andRuppeiner geometry for the $d$-dimensional charged Gauss-Bonnet anti-de Sitterblack holes. The results show that the small-large black hole phase transitionis universal in this gravity. By reducing the thermodynamic quantities with theblack hole charge, we clearly exhibit the phase diagrams in different parameterspaces. Of particular interest is that the radius of the black hole horizon canact as the order parameter to characterize the black hole phase transition. Wealso disclose that different from the five-dimensional neutral black holes, thecharged ones allow the repulsive interaction among its microstructure for smallblack hole of higher temperature. Another significant difference between themis that the microscopic interaction changes during the small-large black holephase transition for the charged case, where the black hole microstructureundergoes a sudden change. These results are helpful for peeking into themicrostructure of charged black holes in the Gauss-Bonnet gravity.

Testing the microstructure of $d$-dimensional charged Gauss-Bonnet anti-de Sitter black holes