Abstract
Field-cooled vortex patterns obtained with magnetic decoration, represent an equilibrium configuration of the vortices established in the sample at some temperature Tq, usually well above the actual temperature of decoration. This “quenching” temperature corresponds to the onset of pinning in the sample and its knowledge is crucial for the interpretation of the decoration data. We developed an experimental method to determine Tq and apply it to the conventional superconductor NbSe2 and the high-Tc superconductor Bi2Sr2CaCu2O8−δ. In the latter case a variation of Tq of the order of a few Kelvin within the sample has been observed.
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