Low Cost AC susceptometer using closed cycle helium cryostat

Abstract

Low temperature ac susceptometer now a days have become a convenient powerful tool in measuring magnetic ordering and dynamical behavior of the ordered state in the variety of the materials. For high TC Superconductors (HTSC) the ac susceptibility measurement have been particularly useful to probe the dynamics of vortices and phase transition in the vortex state. The power of this technique lies in its simplicity and wide range of applicability, which varies from quick characterization of critical temperature (TC) to quantitative analysis of vortex phase diagram and contact less measurement of current density.