3 research outputs found
Imaging Flux Vortices in MgB2 using Transmission Electron Microscopy
We report the successful imaging of flux vortices in single crystal MgB2
using transmission electron microscopy. The specimen was thinned to electron
transparency (350 nm thickness) by focussed ion beam milling. An artefact of
the thinning process was the production of longitudinal thickness undulations
of height 1-2 nm in the sample which acted as pinning sites due to the energy
required for the vortices to cross them. These had a profound effect on the
patterns of vortex order observed which we examine here.
Supplementary information can be downloaded from
http://www-hrem.msm.cam.ac.uk/people/loudon/#publicationsComment: 3 pages, 2 figures to appear in Physica C. Supplementary information
can be downloaded from
http://www-hrem.msm.cam.ac.uk/people/loudon/#publications. The discussion of
the vortex-free region near the sample edge has been revised in response to
referees' comments. Changes have been made to clarify that the specimen
thickness is 250nm parallel to the c-axis but 350nm parallel to the electron
bea