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Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Poster Session

TT 15.19: Poster

Tuesday, February 26, 2008, 14:00–18:00, Poster B

Superconductivity on the Border of Weak Itinerant Ferromagnetism in UCoGeN. T. Huy1, A. Gasparini1, D. E. de Nijs1, Y. Huang1, J. C. P. Klaasse1, T. Gortenmulder1, A. de Visser1, •A. Hamann2, T. Görlach2, and H. v. Löhneysen2,31Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands — 2Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsruhe, Germany — 3Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe, Germany

We report the coexistence of ferromagnetic order and superconductivity in UCoGe at ambient pressure [1]. Magnetization measurements show that UCoGe is a weak ferromagnet with a Curie temperature TC ≈ 3 K and a small ordered moment m0 ≈ 0.03 µB. Superconductivity is observed with a resistive transition temperature Ts ≈ 0.8 K for the best sample. Thermal-expansion and specific-heat measurements provide solid evidence for bulk magnetism and superconductivity. The proximity to a ferromagnetic instability, the defect sensitivity of Ts, and the absence of Pauli limiting, suggest triplet superconductivity mediated by critical ferromagnetic fluctuations.

[1] N. T. Huy et al., PRL 99, 067006 (2007)

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