Giant vortex state in perforated aluminum microsquares

被引:67
作者
Bruyndoncx, V
Rodrigo, JG
Puig, T
Van Look, L
Moshchalkov, VV
Jonckheere, R
机构
[1] Katholieke Univ Leuven, Vaste Stof Fys & Magnetisme Lab, B-3001 Louvain, Belgium
[2] IMEC, B-3001 Louvain, Belgium
来源
PHYSICAL REVIEW B | 1999年 / 60卷 / 06期
关键词
D O I
10.1103/PhysRevB.60.4285
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We investigate the nucleation of superconductivity in a uniform perpendicular magnetic field H in aluminum microsquares containing a few (two and four) 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 nonperforated microsquare reveal cusps at the same values of Phi/Phi(0) (where Phi is the applied magnetic flux threading the rural square area and Phi(0) is the superconducting flux quantum), while the background on T-c(H) becomes quasilinear, 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. [S0163-1829(99)09129-8].
引用
收藏
页码:4285 / 4292
页数:8
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