Modified non-minimal coupling for charged scalars predicts rescaled London penetration depth λ → λ/√2 in superconductors; data for Nb, YBCO and Ba(Fe,Co)2As2 show ratio near 1.4 while Pb and MgB2 are inconclusive or standard-like.
Superfluid density and field-induced magnetism in Ba(Fe 1−xCox)2As2 and Sr(Fe1−xCox)2As2 measured with muon spin rotation,
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Beyond minimal coupling for charged scalars? Modified electrodynamics and London-penetration tests
Modified non-minimal coupling for charged scalars predicts rescaled London penetration depth λ → λ/√2 in superconductors; data for Nb, YBCO and Ba(Fe,Co)2As2 show ratio near 1.4 while Pb and MgB2 are inconclusive or standard-like.