Informal Meetings with Potential Research Advisors

[cavalior7005]

Background: Biochemistry undergrad, hoping to earn a Ph.D. in Geochemistry (stable isotope geochemistry/cosmochemistry interests).

I have a few calls, lunches, etc. with potential research advisors coming up. How best should I prepare for these? I expect that I should read their most recent papers and most cited ones, but beyond that, what else might be expected? Since they aren't formal interviews, might it be more about how our personalities mesh?

I understand there won't be one answer applicable to all cases, but any advice would be greatly appreciated!