Conductivity anisotropy in CaRuO$_3$

ORAL

Abstract

We present terahertz time-domain spectroscopy measurements of the optical conductivity anisotropy in thin films of CaRuO$_3$. Linearly polarized terahertz-bandwidth pulses are transmitted through the films and extended Drude conductivity parameters in the ab-plane and c-axis are extracted. We observe strong optical mass renormalization at low temperatures in both directions that we attribute to interactions with bosonic modes of the system. For both directions we obtain the plasma frequency from the relation $\omega_{p}^{2} = 1/\rho\tau$, where $\rho$ is the dc resistivity and $\tau$ the scattering lifetime in the low-frequency limit. Contrary to the prediction of band theory,\footnote{I. I. Mazin and D. J. Singh, Phys. Rev. B {\bf 56}, 2556 (1997); {\bf 73}, 189903(E) (2006).} we find that the anisotropy in the plasma frequency is less than ten percent.

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Authors

  • Graham Lea

    Simon Fraser University

  • Amir Farahani

    Simon Fraser University

  • Saeid Kamal

    Simon Fraser University

  • Anthony Colaprete

    Triumf, Texas A\&M University, Tel Aviv University, TRIUMF, Simon Fraser University, Dept. of Physics, SFU, BC, Canada, Department of Physics and Astronomy, University of British Columbia, Cavendish Laboratory, University of Cambridge, Department of Physics, Simon Fraser University, University of British Columbia, University of Wisconsin-Madison, Brookhaven National Laboratory, Los Alamos National Laboratory, Department of Molecular Science and Technology, Ajou University, Suwon 443-749, Korea, Department of Physics, Oregon State University, Corvallis, OR 97331-6507, Imago Scientific Instruments Corp., Department of Physics, Simon Fraser University, 8888 University Dr., Burnaby, BC, V5A 1S6 Canada, Linfield College, PNNL, University of Washington, University of Victoria, IUPUI1, Wabash, IUPUI2, Environmental Biotechnology Institute, University of Idaho, Moscow ID 83843, Physics Department, University of Idaho, Moscow ID 83843, Environmental Biotechnology Institute, University of Idaho, Moscow, ID 83844, Physics Department, University of Idaho, Moscow, Idaho 83844, TRIUMF / UBC, 5CSNSM-IN2P3-CNRS, Universit\'e Paris 11, University of Manitoba, Texas A\&M, U. Manitoba, Tel Aviv U., U. British Columbia, Universidad de Pa\'is Vasco, Department of Physics, University of Idaho, Moscow, Idaho 83844-0903, University of Idaho, Boise State University, Idaho State University, NASA Ames Research Center

  • Chang Beom Eom

    University of Wisconsin-Madison

  • J. Steven Dodge

    Simon Fraser University