Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 19: CE: Metal-Insulator Transition 2
TT 19.7: Talk
Wednesday, March 24, 2010, 11:00–11:15, H18
THz and infrared spectroscopy in FeCr2S4 — •Joachim Deisenhofer1, Yurii Goncharov2, Franz Mayr1, Dat Quach3, Joanna Groza3, Vladimir Tsurkan1,4, and Alois Loidl1 — 1Experimentalphysik V, Center for Electronic Correlations and Magnetism, Institute for Physics, Augsburg University, D-86135 Augsburg, Germany — 2General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia — 3Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616, USA — 4Institute of Applied Physics, Academy of Sciences of Moldova, MD-2028 Chişinău, Republic of Moldova
We investigate the Jahn-Teller transition at TJT = 9K in the CMR system FeCr2S4 by THz and IR spectroscopy. Below TJT we observe the appearance of new phonon modes in the far-infrared region and new excitations in the THz regime. We attribute the latter to a splitting of the Fe2+ ground state due to the transition from a dynamic to a static Jahn-Teller distortion.