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TT: Fachverband Tiefe Temperaturen

TT 5: Postersession Superconductivity: Materials - Fabrication and Properties

TT 5.38: Poster

Montag, 23. März 2009, 13:00–16:45, P1A

Raman spectroscopic studies on single crystals of the iron-based superconductor SmFeAsO_1−xF_x — •Ivan Jursic¹, Joachim Schoenes¹, Zbigniew Bukowski², and Janusz Karpinski² — ¹Technische Universität Braunschweig, Institut für Physik der Kondensierten Materie, 38106 Braunschweig, Germany — ²ETH Zürich, Laboratorium fuer Festkörperphysik, 8093 Zürich, Switzerland

The recent discovery of superconductivity in iron-based oxypnctides has led to a great interest in this new class of non-cuprate high-T_c superconductors. Though theoretical work predicts a small electron-phonon coupling, which means that this should not be the driving mechanism for the observerd T_c’s in this class of material, the exact coupling mechanism is still under debate.

We present Raman studies on superconducting SmFeAsO_1−xF_x single crystals where the T_c was determined by SQUID magnetometric measurements to be 34 K. At room temperature polarized measurements were performed to assign the phonon modes. Furthermore studies at different temperatures reaching from 5K to 300K were done to investigate the phonon behavior. The phonon frequencies shift with temperature and we investigate this shift in terms of electron-phonon coupling.