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Prediction of unexpected behavior of the mean inner potential of superconductors

arXiv:1301.4999
(Los Alamos),
Physica C 490, 1 (2013)
Electron holography can measure the mean inner electric potential of materials. The theory of
hole superconductivity predicts that when a material is cooled into the superconducting state it
expels electrons from its interior to the surface, giving rise to a mean inner potential that increases
with sample thickness. Instead, in a normal metal and in a conventional BCS superconductor the
mean inner potential is expected to be independent of sample thickness and temperature. Thus,
this experiment can provide a definitive test of the validity of the theory of hole superconductivity.

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