S. Dubonos et al., VORTEX-RESOLVED STUDIES OF YBA2CU3O7-DELTA FILMS USING BISMUTH HALL PROBES, Superconductor science and technology, 8(5), 1995, pp. 383-386
We have developed a new technique for studying flux dynamics in high-T
(c) films using bismuth Hall probes deposited directly onto the superc
onductor surface. Using this approach we demonstrate single fluxon res
olution in YBa2Cu3O7-delta thin films with good signal-to-noise ratio.
The results of coincidence measurements at adjacent Hall voltage cont
acts indicate that flux motion in the films is uncorrelated at 4.2 K c
onsistent with a high density of strong pinning centres. We propose th
at this new technique could become a very sensitive tool in the challe
nge to understand vortex dynamics in high-T(c) superconductors at the
microscopic level.