We have calculated the absolute value and temperature dependence of the London penetration depth for several values of the strong-coupling index Tcωₗₙ and find large characteristic differences between the weak coupling Tcωₗₙ~0, conventional strong coupling Tcωₗₙ0.25, and very strong coupling Tcωₗₙ~1 regimes. Our results do not depend sensitively on the value of Coulomb pseudopotential, nor on the shape of the electron-boson exchange spectral density, but depend mainly on the characteristic boson energy ωₗₙ.
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Blezius et al. (1988) studied this question.
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