Physics – Condensed Matter – Superconductivity
Scientific paper
1999-10-06
Published in Physical Review B 60, 7489 (1999)
Physics
Condensed Matter
Superconductivity
PDF file, 6 two-columns pages, 9 figures
Scientific paper
10.1103/PhysRevB.60.7489
The paramagnetic Meissner effect (PME) measured in high $T_{C}$ granular superconductors has been attributed to the presence of $\pi$-junctions between the grains. Here we present measurements of complex AC magnetic susceptibility from two-dimensional arrays of conventional (non $\pi$) Nb/Al/AlOx/Nb Josephson junctions. We measured the susceptibility as a function of the temperature $T$, the AC amplitude of the excitation field, $h_{AC}$, and the external magnetic field, $H_{DC}$. The experiments show a strong paramagnetic contribution from the multi-junction loops, which manifests itself as a reentrant screening at low temperature, for values of $h_{AC}$ higher than 50 mOe. A highly simplified model, based on a single loop containing four junction, accounts for this paramagnetic contribution and the range of parameters in which it appears. This model offers an alternative explanation of PME which does not involve $\pi$-junctions.
Araujo-Moreira Fernando M.
Barbara Paola
Cawthorne A. B.
Lobb C. J.
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