In a type-II superconductor the gap variation in the core of a vortex line induces a local charge modulation. Accounting for metallic screening, we determine the line charge of individual vortices and calculate the electric field distribution in the half space above a field penetrated superconductor. The resulting field is that of an atomic size dipole d~eaB^z, aB0ex0ex=0ex0ex²/me² is the Bohr radius, acting on a force microscope in the pico- to femto-Newton range.
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Blatter et al. (1996) studied this question.
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