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      X-ray magnetic circular dichroism in d and f ferromagnetic materials: recent theoretical progress. Part II (Review Article)

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      Low Temperature Physics
      AIP Publishing

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          Heavy-fermion systems

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            Superconductivity on the border of itinerant-electron ferromagnetism in UGe2

            The absence of simple examples of superconductivity adjoining itinerant-electron ferromagnetism in the phase diagram has for many years cast doubt on the validity of conventional models of magnetically mediated superconductivity. On closer examination, however, very few systems have been studied in the extreme conditions of purity, proximity to the ferromagnetic state and very low temperatures required to test the theory definitively. Here we report the observation of superconductivity on the border of ferromagnetism in a pure system, UGe2, which is known to be qualitatively similar to the classic d-electron ferromagnets. The superconductivity that we observe below 1 K, in a limited pressure range on the border of ferromagnetism, seems to arise from the same electrons that produce band magnetism. In this case, superconductivity is most naturally understood in terms of magnetic as opposed to lattice interactions, and by a spin-triplet rather than the spin-singlet pairing normally associated with nearly antiferromagnetic metals.
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              Absorption of circularly polarized x rays in iron.

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                Author and article information

                Journal
                Low Temperature Physics
                Low Temperature Physics
                AIP Publishing
                1063-777X
                1090-6517
                February 2008
                February 2008
                : 34
                : 2
                : 79-112
                Article
                10.1063/1.2834255
                98cd0592-27d0-463b-a560-f1fcb04f4266
                © 2008
                History

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