In this work, we prove the existence of positive solution for the following class of problems
−normalΔu+λVfalse(xfalse)u=ulogu2,1emx∈RN,u∈H1false(RNfalse),
where λ>0 and
V:RN→double-struckR is a potential satisfying some conditions. Using the variational method developed by Szulkin for functionals, which are the sum of a C1 functional with a convex lower semicontinuous functional, we prove that for each large enough λ>0, there exists a positive solution for the problem, and that, as λ→+∞, such solutions converge to a positive solution of the limit problem defined on the domain Ω=int(V−1({0})).