Absolute values of ac susceptibility for rectangular prism specimens

Abstract

Absolute values of ac susceptibility of specimens shaped as a rectangular prism are obtained by numerical calculations of the magnetic field created by the specimen. The obtained values for superconducting samples are compared with the expected value.

Influence of the interaction between the inter- and intragranular magnetic responses in the analysis of the ac susceptibility of a granular FeSe0.5Te0.5superconductor

“…Correspondingly, two peaks are observed in the imaginary part T ( ) c above the diamagnetic transition temperatures, ascribed to the thermal dissipation occurring when the ac magnetic field reaches the centre of the sample and of the individual grains [38][39][40][41]. From the low-temperature c¢ values, the demagnetizing factor of the sample was found to be 0.21 » D , which is consistent with the value found from dc measurements and also in agreement with the calculated values reported in literature for the same sample geometry [59].…”

“…. It is worth emphasizing that this value is smaller than the real one [58,59], due to the not-fullycompleted diamagnetic transition at this temperature.…”

“…The calculated spatial variation of the demagnetizing field for rectangular prisms is reported in Ref. [58], and in the following analysis we will consider average values of the corresponding demagnetizing factor D over the sample volume [59].…”