Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 49: Correlated Electrons: Low-dimensional Systems - Materials 4
TT 49.8: Talk
Friday, March 30, 2012, 11:30–11:45, H 3005
(contribution withdrawn)THz and infrared excitation spectrum below the Jahn-Teller transition in Sr3Cr2O8 — •Zhe Wang1, Michael Schmidt1, Axel Günther1, Franz Mayr1, Diana Quintero-Castro2, 3, A. T. M. Nazmul Islam2, Bella Lake2,3, Hans-Albrecht Krug von Nidda1, Alois Loidl1, and Joachim Deisenhofer1 — 1Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany — 3Institut für Festkörperphysik, Technische Universität Berlin, D-10623 Berlin, Germany
We report on optical excitations observed recently in Sr3Cr2O8 by THz and infrared spectroscopy. Low-energy excitations below 3 THz are detected by THz time domain spectroscopy. These excitations can be divided into two different classes according to the temperature-dependent properties. One is emergent right below the Jahn-Teller transition temperature, which is determined by specific heat measurement to occur at 285 K [1,2]. The other appears only below 100 K, where the fluctuations are sufficiently suppressed, consistent with the temperature dependence of low-energy Raman modes [3]. Infrared transmission measurements reveal a broad crystal-field excitation, which can be associated with an electronic transition from E to T2 orbital states.
Zhe Wang et al., Phys. Rev. B 83, 201102 (2011)
D. L. Quintero-Castro et al., Phys. Rev. B 81, 014415 (2010)
D. Wulferding et al., Phys. Rev. B 84, 064419 (2011)