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TT: Fachverband Tiefe Temperaturen

TT 14: Superconductivity: Non-Cuprate Non-Ferropnictide Superconductors

TT 14.2: Vortrag

Dienstag, 24. März 2009, 09:45–10:00, HSZ 105

Electronic Raman scattering in non–centrosymmetric superconductors — •Ludwig Klam¹, Dietrich Einzel², and Dirk Manske¹ — ¹Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany — ²Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany

Since their recent discovery, non–centrosymmetric superconductors (NCS) form a rapidly growing field of research and represent a completely new class of superconductors which was believed for a long time not to exist at all. We formulate a theory for the polarization–dependence of the electronic (pair–breaking) Raman response for NCS in the clean limit at zero temperature. Possible applications include the systems CePt₃Si and Li₂Pd_xPt_3−xB which reflect the two important classes of the involved spin–orbit coupling.

We provide analytical expressions for the Raman vertices for these two classes and calculate the polarization–dependence of the electronic spectra. We predict a two–peak structure and different power laws with respect to the unknown relative magnitude of the singlet and triplet contributions to the superconducting order parameter, revealing a large variety of characteristic fingerprints of the underlying condensate.