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TT: Fachverband Tiefe Temperaturen

TT 3: Correlated Electrons: Heavy Fermions

TT 3.4: Vortrag

Montag, 26. März 2012, 10:15–10:30, H 3005

Lattice dynamical Properties of the non-centrosymmetric Superconductor CePt₃Si — •Sven Krannich¹, Frank Weber¹, Rolf Heid¹, Klaus-Peter Bohnen¹, Daniel Lamago^1,2, Ludwig Klam³, Dirk Manske⁴, and Hilbert von Löhneysen^1,5 — ¹Karlsruhe Institute of Technology, Institute of Solid State Physics, Karlsruhe, Germany — ²Laboratoire Léon Brillouin, CEA-Saclay, Gif sur Yvette Cedex, France — ³ETH Zürich, Institute for Theoretical Physics, Zürich, Switzerland — ⁴Max Planck Institute for Solid State Research, Department Metzner, Stuttgart, Germany — ⁵Karlsruhe Institute of Technology, Physics Institute, Karlsruhe, Germany

The order parameter of superconductors is usually classified as either a spin singlet (even parity) or a spin triplet (odd parity) by the Pauli exclusion principle. A necessary prerequisite for such a classification is, however, the existence of an inversion center. Something of a stir has been caused by the discovery of bulk superconductivity in CePt₃Si which lacks inversion symmetry. In such systems the existence of an antisymmetric potential gradient causes a parity-breaking antisymmetric spin-orbit coupling (ASOC) that leads to a splitting of the Fermi surface and, moreover, gives rise to the unique possibility of having admixtures of spin-singlet and spin-triplet pairing states. Model calculations including ASOC predict anomalous lattice dynamics even in the non-superconducting state. Here we report on first measurements of the phonon dispersion using inelastic neutron scattering at T= 10 K. Experimental results are compared to DFT calculations including the Ce 4f electrons.