Title: Quantization and confinement effects in superconducting nanostructures
Authors: Moshchalkov, Victor
Baert, M
Metlushko, VV
Rosseel, E
Van Bael, Margriet
Temst, Kristiaan
Bruynseraede, Yvan
Jonckheere, R #
Issue Date: 1996
Publisher: Academic press ltd
Series Title: Superlattices and Microstructures vol:19 issue:3 pages:183-190
Abstract: The confinement of the flux lines by a lattice of submicron holes ('antidots') has been studied in nanostructured superconducting Pb/Ge multilayers. By introducing regular arrays of sufficiently large antidots, multi-quanta vortex lattices have been stabilized. Sharp cusp-like magnetization (M) anomalies, appearing at matching fields H-m = m phi(0)/S in superconducting films with the antidot lattices having a unit cell area S, are successfully explained. These anomalies are, analogues of the well-known M(H) cusp at H-c1, but for the onset of multi-quanta (m + 1)phi(0)-vortices penetration at each subsequent matching field H-m. It is shown that the M(H) curve between the matching fields H-m<H<H-m+1 follows a simple M proportional to ln(H-H-m) dependence. These experimental observations have revealed an unusual expansion of validity of the London limit in superconductors with lattices of relatively large antidots. The successful high quality fit of the M(H, T) curves convincingly demonstrates that a new type of the critical state B = const ('single-terrace critical state') can be realized in superconductors with the antidot lattices. (C) 1996 Academic Press Limited
ISSN: 0749-6036
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
Nuclear and Radiation Physics Section
# (joint) last author

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