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We perform an experiment to test between two theories of the electrodynamicsof superconductors: the standard London theory and an alternative proposed byJ. E. Hirsch [Phys. Rev. B 69, 214515 (2004)]. The two alternatives givedifferent predictions with respect to the screening of an electric field by asuperconductor, and we try to detect this effect using atomic force microscopyon a niobium sample. We also perform the reverse experiment, where wedemonstrate a superconductive tip mounted on a qPlus force sensor. Due tolimited accuracy, we are able neither to prove nor to disprove Hirsch'shypothesis. Within our accuracy of 0.17 N/m, the superconductive transitiondoes not alter the atomic-scale interaction between tip and sample.

Attempts to test an alternative electrodynamic theory of superconductors by low-temperature scanning tunneling and atomic force microscopy