Experimental determination of the (H, T) phase diagram of a superconducting network

Abstract

We have measured the resistive critical temperature Tc of a regular two dimensional network of superconducting indium at low magnetic fields. We find Tc oscillations with a period equal to one quantum flux Φ0 = hc/2e per lattice cell. Well-defined structures also appear at the rational values of the reduced flux Φ/Φ0 = 1/3 and 2/3. These results are compared with theoretical predictions for the (H, T) critical line of the studied network