Direct observation of nonlocal effects in a superconductor.
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 less, similar 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 nonlocal response in a superconductor.
Suter
A
A
Laboratory for Muon Spin Spectroscopy, PSI, CH-5232 Villigen PSI, Switzerland. andreas.suter@psi.ch
Morenzoni
E
E
Khasanov
R
R
Luetkens
H
H
Prokscha
T
T
Garifianov
N
N