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Early Theories of χ′ and χ″ of Superconductors: The Controversial Aspects

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Abstract

The transition from the normal to the superconducting state is characterized by the disappearance of the electrical resistance of a superconductor below its transition temperature, Tc(H), which, as indicated, is a function of magnetic field and the appearance of the Meissner effect i.e. the expulsion of any magnetic field (below some critical value) out of the bulk of the superconductor. This Meissner effect is considered as the hallmark of bulk superconductivity while a drop of the resistance can, at best, serve only as an indication of a superconducting phase transition.

The shielding of ac magnetic field is frequently misinterpreted as a Meissner effect which results in an overestimation of the superconducting volume fraction in investigated samples. On the other hand, questions are raised about the physical interpretation of the complex ac susceptibility (χac = χ′ + iχ″) behavior around Tc, mainly the significance of the χ″ peak(s); is this the expected behavior of a normal conductor with sudden increase of the conductivity or it is more tightly linked with the normal to superconducting phase transition.

In this paper, we will review the different interpretations and discuss the controversial aspects of the xac behavior around Tc.

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Khoder, A.F., Couach, M. (1991). Early Theories of χ′ and χ″ of Superconductors: The Controversial Aspects. In: Hein, R.A., Francavilla, T.L., Liebenberg, D.H. (eds) Magnetic Susceptibility of Superconductors and Other Spin Systems. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2379-0_9

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  • DOI: https://doi.org/10.1007/978-1-4899-2379-0_9

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4899-2381-3

  • Online ISBN: 978-1-4899-2379-0

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