London penetration depth of strongly coupled isotropic superconductors: Low-temperature behavior
X. Leyronas, R. Combescot
DOI 10.1103/PhysRevB.54.3482 · Physical Review B
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Abstract
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 sizable range of parameters, we find that strong-coupling effects can reasonably simulate a power law dependence, sometimes with 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 quasielastic scattering for electrons. The presence of these low-frequency phonons requires rather wide phonon spectra and their effectiveness in scattering implies a fairly strong coupling. © 1996 The American Physical Society.
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