Contributions to Proceedings:

E. Bauer, I. Bonalde, A. Eichler, G. Hilscher, Y. Kitaoka, R. Lackner, St. Laumann, H. Michor, M. Nicklas, P. Rogl, E. Scheidt, M. Sigrist, M. Yogi:
"CePt3Si: Heavy Fermion Superconductivity and Magnetic Order without Inversion Symmetry";
in: "LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics; LT24", Y. Takano, P. Hershfield, S. Hill, P. Hirschfeld, A. Goldman (ed.); AIP Conference Proceedings 850, 2006, 695 - 702.

English abstract:
AIP Conference Proceedings -- September 7, 2006 -- Volume 850, pp. 695-702
LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24

CePt3Si: Heavy Fermion Superconductivity and Magnetic Order without Inversion Symmetry
E. Bauer,* I. Bonalde, A. Eichler,** G. Hilscher,* Y. Kitaoka, R. Lackner,* St. Laumann,* H. Michor,* M. Nicklas,§ P. Rogl,¶ E. W. Scheidt, M. Sigrists, and M. Yogi
*Institute of Solid State Physics, Vienna University of Technology, A-1040 Wien, Austria
Centre de Física, Institute Venezolano de Investigaciones Científicas, Caracas 1020-A Venezuela
**Institute of Applied Physics, Technical University of Braunschweig, D-38106 Braunschweig, Germany
Department of Materials Science and Technology, Osaka University, Osaka 560-8531, Japan
§Max Planck Institute for Chemical Physics of Solids, D-011187 Dresden, Germany
¶Institut für Physikalische Chemie, Universität Wien, A-1090 Wien, Austria
Chemische Physik und Materialwissenschaften, Universität Augsburg, D - 86159 Augsburg, Germany
Institute of Theoretical Physics, ETH-Hönggerberg, 8093 Zürich, Switzerland

Ternary CePt3Si crystallizes in the tetragonal P4mm structure which lacks a center of inversion. Antiferromagnetic order sets in at TN 2.2 K followed by superconductivity (SC) below Tc 0.75 K. Large values of Hc2 −8.5 T/K and Hc2(0) 4 to 5 T were derived, referring to Cooper pairs formed out of heavy quasiparticles. The mass enhancement originates from Kondo interactions with a characteristic temperature TK of roughly 10 K. NMR and µSR results show that both magnetic order and SC coexist on a microscopic scale without having spatial segregation of both phenomena. The absence of an inversion symmetry gives rise to a lifting of the degeneracy of electronic bands by spin-orbit coupling. As a consequence, the SC order parameter may be composed of spin-singlet and spin-triplet components as indicated from a very unique NMR relaxation rate 1/T1 and a linear temperature dependence of the penetration depth . A helical modification of the order parameter would explain the absence of significant anisotropy of the upper critical field when comparing the field parallel and perpendicular to the axis. ©2006 American Institute of Physics

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