Confirmation of Superconductivity of the material by the Coil Method

Abstract

This article is basically based on the design of the coil method.  The coil method is also known as the inductive method or AC susceptibility method. It is a simple, sensitive and non-destructive technique use to confirm the superconductivity in the material. Superconductivity is a phenomenon in which certain materials exhibit zero electrical resistance and perfect diamagnetism when cooled below their critical temperature. In the coil method the sample is placed between the coils carrying alternating current. As the sample is cooled below its critical temperature, it expels magnetic flux due to the Meissner effect, causing a change in the coil’s inductance, impedance. These changes are measured using suitable electronic instruments and indicate the onset of superconductivity. The coil method is widely used in research laboratories because it provides accurate determination of the critical temperature without requiring direct electrical contact with the sample. It is an important technique for studying superconducting material and has applications in physics research. I have used this technique on BSCCO sample and collect the data. The critical temperature of BSCCO is found to be 92 K using this coil method.