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TT: Fachverband Tiefe Temperaturen

TT 49: Correlated Electrons: Low-dimensional Systems - Materials 4

TT 49.9: Talk

Friday, March 30, 2012, 11:45–12:00, H 3005

(contribution withdrawn)

Optical spectroscopy of the Triangular Lattice Antiferromagnets CuCrO2 and α-CaCr2O4 — •Michael Schmidt1, Zhe Wang1, Franz Mayr1, Sandor Toth2,3, Bella Lake2,3, Nazmul Islam2, Vladimir Tsurkan1, Alois Loidl1, and Joachim Deisenhofer11Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany — 2Helmholtz Zentrum Berlin, Berlin 14109, Germany — 3Institut für Festkörperphysik, Technische Universität Berlin, D-10623 Berlin, Germany

We will compare and discuss our results obtained by optical spectroscopy on CuCrO2 and α-CaCr2O4. While CuCrO2 is famous for its multiferroicity [1], in α-CaCr2O4 a polarization can only be observed under the application of electric or magnetic field, despite having a closely related structure [2]. At near infrared and visible light frequencies we observe Cr3+ crystal field absorptions and below TN excitons and exciton-magnon-transitions appear. The width of these exciton-magnon transitions is analyzed with respect to the existence of Z2 vortices as proposed by Kojima et al. [3].
S. Seki et al., Phys. Rev. Lett. 101, 067240 (2008)
K. Singh et al., Phys. Rev. B 84, 064129 (2011)
N. Kojima et al., J. Phys. Soc. Jpn. 62, 4137 (1993)

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