Junji Endo coauthored an Aharonov-Bohm effect experiment using electron holography. Electron paths passing through and outside a coated toroid acquired a relative phase shift even though superconductivity confined the magnetic flux away from the electron paths.[ref]
Evidence for Aharonov-Bohm effect with magnetic field completely shielded from electron wave by Akira Tonomura and others. Physical Review Letters 56 (1986), p. 792: full author list and abstract, coated toroidal ferromagnet and electron-holographic relative phase measurement.
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