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.
Hole-doping dependence of the magnetic penetration depth and vortex core size in Yba 2Cu3Oy: Evidence for stripe correlations near 1/8 hole doping
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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.