Dresden 2009 – wissenschaftliches Programm
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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 SmFeAsO1−xFx — •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-Tc superconductors. Though theoretical work predicts a small electron-phonon coupling, which means that this should not be the driving mechanism for the observerd Tc’s in this class of material, the exact coupling mechanism is still under debate.
We present Raman studies on superconducting SmFeAsO1−xFx single crystals where the Tc 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.