Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 9: SC: Poster Session
TT 9.35: Poster
Montag, 22. März 2010, 14:00–18:00, Poster A
Low-temperature thermal expansion of URhGe — •Sebastian Zaum1,2, Frédéric Hardy1, Kai Grube1, Roland Schäfer1, Christoph Meingast1, Hilbert v. Löhneysen1,2, Dai Aoki3, and Jacques Flouquet3 — 1Karlsruher Institut für Technologie, Institut für Festkörperphysik, 76021 Karlsruhe, Germany — 2Karlsruher Institut für Technologie, Physikalisches Institut, 76128 Karlsruhe, Germany — 3Commissariat à l’Énergie Atomique, INAC, SPSMS, 17 rue des Martyrs, 38054 Grenoble, France
URhGe is one of the few ferromagnetic superconductors. At ambient pressure, it exhibits superconductivity with an upper critical field of Bc2∥ b≈ 2 T. A characteristic feature of these superconductors is their strong magnetic anisotropy. In URhGe, the magnetic field can be used to tune the system to a metamagnetic transition where the magnetic moment reveals a sudden rotation in the crystallographic bc plane and superconductivity reappears at a magnetic field of B≈ 12 T with B∥ b. To study the anisotropic coupling of ferromagnetism and superconductivity to the crystal lattice, we performed thermal expansion measurements of a URhGe crystal in the temperature range 30 mK < T < 15 K and in magnetic fields up to 14 T. At B=0, the measurements show the ferromagnetic transition at TC≈ 10 K and confirm bulk superconductivity below Tsc≈ 0.2 K. The field dependence of the thermal expansion and first results of the uniaxial pressure dependences of Tsc will be presented and discussed in comparison with related U-based superconductors.