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Dresden 2006 – scientific programme

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TT: Tiefe Temperaturen

TT 18: Superconductivity: Borides, Borocarbides, Carbides, ...

TT 18.10: Talk

Tuesday, March 28, 2006, 17:30–17:45, HSZ 02

The Fermi surface topology and the superconducting gap function in UPd2Al3: a neutron spin-echo study — •Arno Hiess1, Elizabeth Blackburn1,2, Maikel C. Rheinstädter1, Wolfgang Häußler1,3, Nicholas Bernhoeft4, and Gerry H. Lander21Institut Laue-Langevin, BP 156, F-38042 Grenoble, France — 2European Commission, JRC, ITU, Postfach 2340, D-76125 Karlsruhe, Germany — 3FRM-II, TU München, D-85748 Garching, Germany — 4DRFMC, CEA-Grenoble, F-38054 Grenoble, France

We report on a single crystal neutron spin-echo investigation of the low-energy dynamic response in the magnetic superconductor UPd2Al3 (TN = 14 K, Tsc = 2 K) in the vicinity of the antiferromagnetic wavevector Q0 = (0 0 0.5). Well inside the superconducting phase, antiferromagnetic quasielastic scattering, which is present in the normal state, is absent for relaxation times shorter than 10 ns, equivalent to an energy resolution better than 1 µeV. These observations are related to the geometry of the gap function and the Fermi surface topology. Any nodes present at the Fermi surface do not contribute significant weight to the electronic susceptibility. This places strong constraints on possible models for the origin and role of magnetic excitations in this magnetic superconductor.

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