1109.1357 (S. K. He et al.)

Wire network behavior in superconducting Nb films with diluted
triangular arrays of holes    [PDF]

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

We present transport measurement results on superconducting Nb films with
diluted triangular arrays (honeycomb and kagom\'{e}) of holes. The patterned
films have large disk-shaped interstitial regions even when the edge-to-edge
separations between nearest neighboring holes are comparable to the coherence
length. Changes in the field interval of two consecutive minima in the field
dependent resistance $R(H)$ curves are observed. In the low field region, fine
structures in the $R(H)$ and $T_c(H)$ curves are identified in both arrays.
Comparison of experimental data with calculation results shows that these
structures observed in honeycomb and kagom\'{e} hole arrays resemble those in
wire networks with triangular and $T_3$ symmetries, respectively. Our findings
suggest that even in these specified periodic hole arrays with very large
interstitial regions, the low field fine structures are determined by the
connectivity of the arrays

View original: http://arxiv.org/abs/1109.1357