Collective and plastic vortex motion in superconductors at high flux densities
Article Abstract:
Scanning tunnelling microscope experiments undertaken at 4.3 K in fields B up to 1.9 T make it possible to produce images containing both topographic and spectroscopic information. Columnar defects and vortices can be seen simultaneously, with the defects being visible as black spots. It was found that, where strongly pinning line defects are present, the vortex lattice stays pinned until the number of vortices is around twice that of the defects. At this point, plastic creep starts. If there is weak intrinsic point disorder, the vortices creep coherently along one of the main axes of the vortex lattice.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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A new age for type-II superconductors?
Article Abstract:
Methods to pin down string-like magnetic vortices that impair superconductors have been developed. The direction of screening currents can be repeatedly reversed to induce stable tornado-like helical twisters. The twisters are composed of thousands of vortex lines braided into highly stable structures. The stability of the twisters show that vortex cutting impedances are high enough to have significant dynamical consequences.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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A Bragg glass phase in the vortex lattice of a superconductor
Article Abstract:
Research on vortex lattices and its implications for superconductors are examined in detail. A power-law decay has been found from vortex lattice data.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2001
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