Regensburg 2002 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 21: Schwere Fermionen, Kondo-Systeme II (gemeinsam mit FV-Magnetismus)

TT 21.1: Hauptvortrag

Donnerstag, 14. März 2002, 14:00–14:30, H20

Experimental Studies of Ferromagnetic Superconductors — •C. Pfleiderer1, M. Uhlarz1, R. Vollmer1, H. v. Löhneysen1,2, S. M. Hayden3, G. G. Lonzarich4, A. D. Huxely5, and J. Flouquet51Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsruhe, Germany — 2Institut für Festkörperphysik, Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany — 3H. H. Wills Physics Laboratory, Bristol BS8 1TL, UK — 4Cavendish Laboratory, Cambridge CB3 0HE, UK — 5DRFMC-SPSMS, CEA Grenoble, F-38054 Grenoble Cedex 9, France

Itinerant ferromagnetism and superconductivity were long believed to represent incompatible forms of electronic order. The recent observation of superconductivity in the ferromagnetic state of UGe2 [1], ZrZn2 [2] and URhGe [3], on the other hand, contradicts the traditional view and suggests that their coexistence may well be a wide spread phenomenon. We review the superconducting and ferromagnetic phase diagrams and consider salient features of the magnetisation of ZrZn2 and UGe2 that are consistent with an abundance of nearly critical longitudinal spin fluctuations. These characteristics of the bulk magnetisation, when taken together with recent elastic neutron scattering experiments on UGe2, suggest ferromagnetically mediated equal spin pairing.

[1] S. S. Saxena et al., Nature 406 (2000) 587.

[2] C. Pfleiderer et al., Nature 412 (2001) 58.

[3] D. Aoki et al., Nature 413 (2001) 613.

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