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.
Laboratory for Muon Spin Spectroscopy, PSI, CH-5232 Villigen PSI, Switzerland. andreas.suter@psi.ch
A
A
Suter
E
E
Morenzoni
R
R
Khasanov
H
H
Luetkens
T
T
Prokscha
N
N
Garifianov