Physics – Condensed Matter – Superconductivity
Scientific paper
1999-05-07
Phys. Rev. B 60, 4285 (1999)
Physics
Condensed Matter
Superconductivity
14 pages, 6 PS figures, RevTex, accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.60.4285
We investigate the nucleation of superconductivity in a uniform perpendicular magnetic field H in aluminum microsquares containing a few (2 and 4) submicron holes (antidots). The normal/superconducting phase boundary T_c(H) of these structures shows a quite different behavior in low and high fields. In the low magnetic field regime fluxoid quantization around each antidot leads to oscillations in T_c(H), expected from the specific sample geometry, and reminiscent of the network behavior. In high magnetic fields, the T_c(H) boundaries of the perforated and a reference non-perforated microsquare reveal cusps at the same values of Phi/Phi_0 (where Phi is the applied flux threading the total square area and Phi_0 is the superconducting flux quantum), while the background on T_c(H) becomes quasi-linear, indicating that a giant vortex state is established. The influence of the actual geometries on T_c(H) is analyzed in the framework of the linearized Ginzburg-Landau theory.
Bruyndoncx V.
Jonckheere Raymond
Look Van L.
Moshchalkov Victor V.
Puig T.
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