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SUMMARY:Direct observation of vortex configurations in mesoscopic supercon
 ductors: vortex shells\, magic numbers and more... - Irina Grigorieva\, Sc
 hool of Physics and Astronomy\, University of Manchester
DTSTART:20060523T140000Z
DTEND:20060523T150000Z
UID:TALK4885@talks.cam.ac.uk
CONTACT:Edmund Ward
DESCRIPTION:Vortices in superconductors are often regarded as a distinct s
 tate of matter\, representing an ensemble of interacting particles whose d
 ensity can be varied simply by changing the externally applied magnetic fi
 eld. When\, in addition\, vortices are confined in a small (mesoscopic) su
 perconductor\, their number and spatial arrangement correspond to a series
  of discrete superconducting states characterized by vorticity L. A number
  of new and exotic states have been reported or predicted for such mesosco
 pic superconductors: paramagnetic Meissner effect\, fractional and negativ
 e vortices\, giant vortices and distinct multivortex states. We have studi
 ed multi-vortex configurations in mesoscopic superconductors directly\, by
  using the Bitter decoration technique and the results will be reviewed in
  this talk. Two different types of mesoscopic samples have been studied: t
 hin-film based and single-crystal-based. In both cases\, confinement was f
 ound to have a profound effect on vortex arrangements\, e.g.\, concentric 
 shells of vortices were found for circular geometry\, with well defined sh
 ell-filling rules and magic numbers for vorticities corresponding to compl
 ete vortex shells. The observed behaviour will be compared with that for s
 ome other confined systems of interacting particles.
LOCATION:T001 [Tower Seminar Room]\, Materials Science and Metallurgy\, De
 partment of
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