Polarized neutron reflectometry (PNR) provides evidence that nonlocal electrodynamics governs the magnetic field penetration in an extreme low-k superconductor. The sample is an indium film with a large elastic mean free path (11 mkm) deposited on a silicon oxide wafer. It is shown that PNR can resolve the difference between the reflected neutron spin asymmetries predicted by the local and nonlocal theories of superconductivity. The experimental data support the nonlocal theory, which predicts a nonmonotonic decay of the magnetic field.
@article{arxiv.0704.1872,
title = {Evidence for nonmonotonic magnetic field penetration in a type-I superconductor},
author = {V. F. Kozhevnikov and C. V. Giuraniuc and M. J. Van Bael and K. Temst and C. Van Haesendonck and T. M. Mishonov and T. Charlton and R. M. Dalgliesh and Yu. N. Khaidukov and Yu. V. Nikitenko and V. L. Aksenov and V. N. Gladilin and V. M. Fomin and J. T. Devreese and J. O. Indekeu},
journal= {arXiv preprint arXiv:0704.1872},
year = {2009}
}
Comments
5 pages, 4 figures, LaTex, corrected typos and figures