Abstract
A novel Hall probe array technique is used to measure the spatial distribution and time dependence of the magnetic induction in YBa2Cu3O7-δ crystals. Analysis of the data based on the flux diffusion equation allows a direct, model-independent determination of the local activation energy U and the logarithmic time scale t0 for flux creep. The results indicate that the spatial variations of U are small (±kT) and that U increases logarithmically with time. The time t0 is inversely proportional to the field and it exhibits a nonmonotonic temperature dependence. These results confirm theoretical predictions based on the logarithmic solution of the flux diffusion equation.
Original language | English |
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Pages (from-to) | 2404-2407 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 75 |
Issue number | 12 |
DOIs | |
State | Published - 1995 |
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Local Hall Probe Magnetometer
Wolfus, S. (Manager)
Institute of Superconductivity Laboratory for Magnetic MeasurementsEquipment/facility: Equipment