1203.0269 (W. J. Zhang et al.)

Edge superconducting state in Nb thin film with rectangular arrays of
antidots    [PDF]

W. J. Zhang, S. K. He, H. F. Liu, G. M. Xue, H. Xiao, B. H. Li, Z. C. Wen, X. F. Han, S. P. Zhao, C. Z. Gu, X. G. Qiu, Victor V. Moshchalkov

Superconducting Nb thin films with rectangular arrays of submicron antidots have been systemically investigated by transport measurements. In low fields, the magnetoresistance curves demonstrate well-defined dips at integral and rational numbers of flux quanta per unit cell, which corresponds to a superconducting wire network-like regime. When the magnetic field is higher than a saturation field, interstitial vortices interrupt the collective oscillation in low fields and form vortex sublattice, where a larger magnetic field interval is observed. In higher fields, a crossover behavior from the interstitial sublattice state to a single-loop-like state is observed, characterized by oscillations with a period of $\Phi_0/\pi r_{eff}^2$, originating from the existence of edge superconducting states with a size $r_{eff}$ around the antidots.

View original: http://arxiv.org/abs/1203.0269