Paramagnetic and diamagnetic states in two-dimensional Josephson-junction arrays

Details Paramagnetic and diamagnetic states in two-dimensional Josephson-junction arrays Paramagnetic and diamagnetic states in two-dimensional Josephson-junction arrays

2002-05-21

arxiv.org/abs/cond-mat/0205434v1

Physics

Condensed Matter

Superconductivity

12 pages, 4 figures, submitted to Phys.Rev.Lett

Scientific paper

Many experiments on high-temperature superconductors have shown paramagnetic behavior when the sample is field cooled. The paramagnetism was first attributed to a d-wave order parameter creating pi-junctions in the samples. However, the same effect was later discovered in traditional low-temperature superconductors and conventional Josephson-junction arrays which are s-wave. By simulating both conventional and mixed pi/conventional Josephson-junction arrays we determine that differences exist which may be sufficient to clearly identify the presence (or absence) of pi-junctions. In particular the pi-junctions cause a symmetry breaking providing a measurable signature of their presence in sample.

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