Paramagnetic and Diamagnetic States in Two-Dimensional Josephson-Junction Arrays

Cinzia De Leo; Giacomo Rotoli

doi:10.1103/PhysRevLett.89.167001

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Paramagnetic and Diamagnetic States in Two-Dimensional Josephson-Junction Arrays

Cinzia De Leo, Giacomo Rotoli

DOI 10.1103/PhysRevLett.89.167001 · Physical Review Letters

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Abstract

Many experiments on high-temperature superconductors have shown paramagnetic behavior when the sample is field cooled. The paramagnetism was attributed to a d-wave order parameter creating π-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 π/conventional Josephson-junction arrays we determine that differences exist which may be sufficient to clearly identify the presence of π junctions. In particular, the π junctions cause a symmetry breaking providing a measurable signature of their presence.