Direct observation of non-local effects in a superconductor
A. Suter, E. Morenzoni, R. Khasanov, H. Luetkens, T. Prokscha, N. Garifianov
Abstract
We have used the technique of low energy muon spin rotation to measure the local magnetic field profile B(z) beneath the surface of a lead film maintained in the Meissner state (z depth from the surface, z <= 200 nm). The data unambiguously show that B(z) clearly deviates from an exponential law and represent the first direct, model independent proof for a non-local response in a superconductor.
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