THz and infrared excitation spectrum below the Jahn-Teller transition in Sr3Cr2O8

ORAL

Abstract

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. \\[4pt] [1] Zhe Wang \textit{et al}., Phys. Rev. B \textbf{83}, 201102 (2011) \\[0pt] [2] D. L. Quintero-Castro \textit{et al}., Phys. Rev. B \textbf{81}, 014415 (2010) \\[0pt] [3] D. Wulferding \textit{et al}., Phys. Rev. B \textbf{84}, 064419 (2011)

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Authors

  • Zhe Wang

    • Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany

  • Michael Schmidt

    • Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany

  • Axel G\"{u}nther

    • Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany

  • Sebastian Schaile

    • Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany

  • Nikola Pascher

    • Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany

  • Franz Mayr

    • Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany

  • Yurii Goncharov

    • Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany

  • Hans-Albrecht Krug von Nidda

    • Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany

  • Alois Loidl

    • Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany

  • Diana Quintero-Castro

    • Helmholtz-Zentrum Berlin f\"ur Materialien und Energie, D-14109 Berlin, Germany

  • A.T.M.N. Islam

    • Helmholtz-Zentrum Berlin f\"ur Materialien und Energie, D-14109 Berlin, Germany

  • Bella Lake

    • Helmholtz-Zentrum Berlin f\"ur Materialien und Energie, D-14109 Berlin, Germany

  • Joachim Deisenhofer

    • Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany