Simultaneous onset of ferromagnetism and superconductivity.
In a few compounds, magnetic ordering and superconductivity appear to arise at the same value of a critical parameter. Assuming a model of magnetic ordering based on localized spins, this simultaneous onset may be explained as a coupling of two conduction electrons via one localized spin. This is analogous to magnetic order arising from coupling of two localized spins via one conduction electron.
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Department of Physics (0319), University of California, San Diego, La Jolla, California 92093, USA.