Title: Nucleation of superconductivity in a mesoscopic loop of varying width
Authors: Morelle, Mathieu ×
Golubovic, DS
Moshchalkov, Victor #
Issue Date: 2004
Series Title: Physical review. B, Condensed matter and materials physics vol:70 issue:14
Conference: date:Katholieke Univ Leuven, Nanoscale Superconduct & Magnetism Grp, Lab Solid State Phys & Magnetism, B-3001 Louvain, Belgium
Abstract: We study the evolution of the superconducting state in a perforated disk by varying the size of the hole. The superconducting properties are investigated by means of transport measurements around the superconducting/normal phase boundary T-c(H). A transition from a one-dimensional to a two-dimensional regime is seen when increasing the magnetic field for disks with small holes. A good agreement is found between the measured T-c(H) line and the calculations performed in the framework of the linearized Ginzburg-Landau theory. The effect of breaking the axial symmetry of the structure by moving the hole away from the center of the disk is also studied. An enhanced critical field is found for the asymmetric structures, possibly due to the recovery of the singly connected state.
ISSN: 1098-0121
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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