The density of states for the two spin directions in a ferromagnetic insulator, e.g., LBCO. is the exchange splitting and 8t is the band width.
A schematic illustration of a Josephson junction through a ferromagnetic insulator in a two-dimensional tight-binding lattice model.
A phase diagram in the and plane for FM and FI . The black and white regions correspond to - and 0-junctions, respectively.
A schematic illustration of a c-axis stack high- superconductor/LBCO/high-Tc superconductor Josephson junction (a) and a high- ring which can be used in experimental observations of -junctions (b).
The Josephson critical current as a function of the FI thickness at for a c-axis stack LSCO/LBCO/LSCO junction with , , and . The large (small) circles indicate a -junction.
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