  The experimental investigation of the $I_c(B)$--$T_c(B)$ phase boundary of
superconducting niobium films with large area quasihexagonal hole arrays is
reported. The hole arrays were patterned with microsphere photolithography. We
investigate the perforated niobium films by means of electrical directed
current transport measurements close to the transition temperature $T_c$ in
perpendicularly applied magnetic fields. We find pronounced modulations of the
critcal current with applied magnetic field, which we interpret as a
consequence of commensurable states between the Abrikosov vortex lattice and
the quasihexagonal pinning array. Furthermore, we observe Little-Parks
oscillations in the critical temperature vs magnetic field.
