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.
Niobium’s intrinsic coherence length and penetration depth revisited using low-energy muon spin spectroscopy and secondary-ion mass spectrometry
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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.