Dear Colleagues,

In principle, superconductivity and magnetism are two competing orders of matter and therefore, in theory, should be mutually excluded. However, there are situations, already predicted by Vitaly Ginzburg in 1950, in which the two phenomena can coexist. For example, the coexistence of superconductivity and ferromagnetism may be easily achieved in artificially fabricated superconductor/ferromagnet heterostructures. In this way, the Cooper pairs penetrate into the ferromagnetic layer for proximity effect, and one has the unique possibility to study properties of superconducting electrons under the influence of a large exchange field. These eterostructures are also suitable for a lot of technical applications. In a conventional superconductor, the glue of Cooper pairs are phonons, i.e., vibrations of the crystal lattice. For example, in the case of the heavy fermion superconductors such as CePd2Si2 and CeIn3, the charge carriers are bound together in pairs by magnetic spin–spin interactions as it is possible also to have triplet superconductivity in ferromagnets. Furthermore, it is now almost certain that the mechanism responsible for superconductivity in cuprates and in iron pnictides is antiferromagnetic spin fluctuations. All these examples and many others indicate how deep the interplay can be between magnetism and superconductivity.

Prof. Dr. Giovanni Ummarino
Guest Editor

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