Design and fabrication of an experimental set up for AC susceptibility measurement

Abstract

An Experimental set up for ac susceptibility measurement, is designed and fabricated. The former material chosen is Teflon. The first design consists of a primary coil, a secondary coil and a sample holder. Copper wire (150micron) winding was done on the primary as well as the secondary coil. The secondary coil is a two coil system in which the two winding is in opposite direction to each other. The set-up is based on the phenomenon of “mutual induction”. Due to some accident, the first setup got damaged before the experiments could be finished. Hence a second setup is fabricated, but this time the sample holder part is omitted. The sample is directly inserted inside the secondary. To monitor the temperature, a Pt100 sensor is put inside the secondary, in contact with the sample.
To test the setup, La0.67Sr0.33MnO3 (LSMO) is prepared by auto combustion sol gel method. First the LSMO is characterized by XRD and it is found to be single phase. Then the sample is inserted into the sample holder and ac susceptibility is measured, as a function of temperature, higher than 300K.