Experimental determination of correlations between spontaneously formed   vortices in a superconductor
  We have imaged spontaneously created arrays of vortices (magnetic flux quanta), generated in a superconducting film quenched through its transition temperature at rates around $10^9 K/s$. From these images, we calculated the positional correlation functions for two vortices and for 3 vortices. We compared our results with simulations of the time dependent Ginzburg Landau equation in 2D. The results are in agreement with the Kibble-Zurek scenario of spontaneous vortex creation. In addition, the correlation functions are insensitive to the presence of a gauge field. 
Daniel Golubchik, Emil Polturak, Gad Koren, Boris Ya. Shapiro, and   Irina Shapiro
cond-mat.stat-mech cond-mat.supr-con