Method for Measuring the Resistive Transition and Critical Current in Superconductors using Pulsed Current.
Patent, Filed 31 Oct 90, patented 29 Jun 93,
DEPARTMENT OF THE NAVY WASHINGTON DC
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The present invention provides a method for measuring the intragranular and intergranular critical current of a granular superconductive material, comprising the steps of 1 conducting a substantially rectangular electronic pulse through the material so as to conduct a current through the material such that when the intergranular critical current of the material is exceeded, any grains present in the material remain in a superconducting state when the current level is below the intragranular critical current 2 measuring the current through the material while conducting the pulse 3 measuring a voltage difference across the material while conducting the pulse 4 determining the non-zero voltage difference across the material and contemporaneously measuring the current and 5 determining the intragranular critical current through the material by varying the current to discern a current level at which the electrical resistance of the material increases to that of the non-superconducting state as the grains of the material transition from the superconducting to a non-superconducting state. This method may also be used to determine the critical current of a homogeneous superconductive material
- Electricity and Magnetism
- Laminates and Composite Materials
- Ceramics, Refractories and Glass