Fig. 2
From: Unveiling the vortex glass phase in the surface and volume of a type-II superconductor
Magnetic decoration images of individual vortices (black dots) in the Bragg and the vortex glass phases of pristine (P) and electron-irradiated (A and B) Bi\({}_{2}\)Sr\({}_{2}\)CaCu\({}_{2}\)O\({}_{8+\delta }\) samples. Images are taken with an scanning-electron microscope at room temperature after performing the magnetic decoration experiments. Vortex structures in the Bragg glass phase for a \(B/{B}_{{\rm{ord-dis}}}=0.28\) in sample P and b \(B/{B}_{{\rm{ord-dis}}}=0.8\) in sample A. c Large field-of-view snapshot of the vortex-glass phase observed in sample B for \(B/{B}_{{\rm{ord-dis}}}=1.62\). Delaunay triangulations are superimposed on the structures: neighboring vortices are connected by dark blue lines and non-sixfold coordinated vortices are highlighted in red. Topological defects indicated with colors: grain boundaries highlighted in violet, edge dislocations in orange and twisted bonds in pink. Red arrows indicate the Burgers vectors of paired edge dislocations; no arrows are shown if dislocations seem to be unpaired in our experimental field-of-view. White bars indicate 5 \(\upmu\)m
