A simplified approach to the temperature, frequency, and applied field variation in AC susceptibility measurements of bulk superconductors

Authors

  • Bess G. Singidas National Institute of Physics, University of the Philippines Diliman
  • Roland V. Sarmago National Institute of Physics, University of the Philippines Diliman

Abstract

A qualitative model for the response of granular superconductors in AC magnetic fields is derived from first principles. By taking into account Faraday induced currents andfields due to time varying flux within the penetration depth and in the grain boundaries, an out-of-phase component, χ", appears in the AC magnetization. λ(T) and R(T) give rise to the χ" peak near Tc. The dependence of the shielding of the Josephson weak links on intergranular phase coherence gives rise to the χ" peak below Tc and the corresponding hump below Tc in χ'. Frequency and applied field dependence of the AC magnetization is discussed using this model.

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Issue

Article ID

SPP-2003-1G-04

Section

Superconductivity

Published

2003-10-22

How to Cite

[1]
BG Singidas and RV Sarmago, A simplified approach to the temperature, frequency, and applied field variation in AC susceptibility measurements of bulk superconductors, Proceedings of the Samahang Pisika ng Pilipinas 21, SPP-2003-1G-04 (2003). URL: https://proceedings.spp-online.org/article/view/SPP-2003-1G-04.