Abstract
A technique for detecting superconductivity in small samples of high temperature superconductor is described. The sample is placed within the inductor of a Colpitts oscillator. The precise quantity of feedback is finely adjusted to maintain oscillation at a set amplitude. The presence of superconductivity is detected through a small but sudden change in frequency and an increase in the gain required to maintain oscillations. The value of critical shielding current may also be estimated in these experiments. The various modes of application of the technique are illustrated by typical experimental results.
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