How does optical response of SrRuO3 and CaRuO3 thin films deviate from Fermi liquid predictions?

ORAL

Abstract

Orthorhombic pervoskites SrRuO3 and CaRuO3 are strongly correlated metals with unusual transport properties. Previous optics studies in the infrared and terahertz range shows non-Drude dynamics and fractional scattering rates at low temperatures which seems to contradict a Fermi-liquid picture with long-lived quasiparticles. Here we present time domain THz measurements of clean thin films of SrRuO3 and CaRuO3. Our results demonstrate for both materials the low temperature conductivity shows a narrow Drude-like peak and can be fitted with two Drude terms. The conductivity crosses over to become less coherent at higher temperatures. Comparison with Fermi liquid scaling theories shows that CaRuO3 is more anomalous than SrRuO3 probably owing to spin fluctuations in the paramagnetic phase.

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Presenters

  • Youcheng Wang

    Department of Physics, Institute for Quantum Matter, Johns Hopkins University

Authors

  • Youcheng Wang

    Department of Physics, Institute for Quantum Matter, Johns Hopkins University

  • Grace Bossé

    Department of Physics, Institute for Quantum Matter, Johns Hopkins University

  • Hari Nair

    Cornell University, Department of Materials Science and Engineering, Kavli Institute at Cornell for Nanoscale Science, Cornell University

  • Jacob P Ruf

    Cornell University, Department of Physics, Laboratory of Atomic and Solid State Physics, Kavli Institute at Cornell for Nanoscale Science, Cornell University

  • Bing Cheng

    Department of Physics, Institute for Quantum Matter, Johns Hopkins University, Department of Physics and Astronomy, Johns Hopkins University

  • Darrell G. Schlom

    Cornell University, Cornell University, Ithaca, New York 14853, USA, Department of Materials Science and Engineering, Cornell University, Department of Materials Science and Engineering, Kavli Institute at Cornell for Nanoscale Science, Cornell University, Materials Science & Engineering, Cornell University, Department of Materials Science and Engineering,, Cornell University, Materials Science and Engineering, University of Cornell

  • Kyle M Shen

    Cornell University, Department of Physics, Laboratory of Atomic and Solid State Physics, Kavli Institute at Cornell for Nanoscale Science, Cornell University

  • Norman Armitage

    Johns Hopkins University, Department of Physics, Institute for Quantum Matter, Johns Hopkins University