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Clauss, C.
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article
The phase boundary of superconducting niobium thin films with antidot arrays fabricated with microsphere photolithography
Abstract
The experimental investigation of the I<SUB>c</SUB>(B)-T<SUB>c</SUB>(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<SUB>c</SUB> in perpendicularly applied magnetic fields. We find pronounced modulations of the critical 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 versus magnetic field....