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Journal of Superconductivity

, Volume 4, Issue 5, pp 393–396 | Cite as

On the temperature dependence of the London penetration depth in a superconductor

  • G. M. Eliashberg
  • G. V. Klimovitch
  • A. V. Rylyakov
Articles

Abstract

In the framework of the electron-phonon theory of superconductivity [1], it is shown that the magnetic field penetration depthδL increases like a certain power of temperature atT≪Tc due to the low-lying excitations in the phonon spectrum. For the acoustic phonons with the density of states ∼ω2 the penetration depth increases ∼T5. The origin of such a high power ofT is the same as that in the case of resistivity of the normal metal: the phonon corrections to the electromagnetic vertex should be taken into account, and major terms (∼T3) cancel, the surviving ones having a higher power ofT. The possibility of linear and quadratic terms inδL(T) is discussed in a model of electrons interacting with two-level centers [2].

Key words

London penetration depth temperature dependence 

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Copyright information

© Plenum Publishing Corporation 1991

Authors and Affiliations

  • G. M. Eliashberg
    • 1
  • G. V. Klimovitch
    • 1
  • A. V. Rylyakov
    • 1
  1. 1.Grenoble High Magnetic Field LaboratoryCentre National de la Recherche Scientifique and Max Planck Institut für FestkörperforschungGrenobleFrance

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