The London penetration depth of strongly coupled isotropic superconductors : low temperature behaviour

Details The London penetration depth of strongly coupled isotropic superconductors : low temperature behaviour The London penetration depth of strongly coupled isotropic superconductors : low temperature behaviour

1996-03-06

arxiv.org/abs/cond-mat/9603040v1

Phys. Rev. B, 54 (1996) 3482

Physics

Condensed Matter

8 pages, revtex, 9 figures

Scientific paper

10.1103/PhysRevB.54.3482

We proceed to a systematic exploration of the low temperature dependence of the London penetration depth of isotropic superconductors within strong coupling theory in the clean limit. For a sizeable range of parameters, we find that strong coupling effects can reasonably simulate a power law dependence, sometimes with an excellent precision. In such cases it would be quite difficult to distinguish experimentally between a pure power law and the strong coupling result. Physically we have been able to ascribe this temperature dependence to low frequency phonons which produce a quasi elastic scattering for electrons. The presence of these low frequency phonons requires rather wide phonon spectra and their effectiveness in scattering implies fairly strong coupling.

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