Comparative study of low-lying excitations in cuprate and strontium ruthenate superconductors

ORAL

Abstract

High-Tc cuprate superconductors in their normal state are known to have the mysterious strange-metal behavior near optimal doping with strong deviations from the conventional Fermi Liquid form of electronic scattering rates. In particular, these have been described by the marginal-fermi-liquid (MFL) form at optimal doping [1], or more generally the power-law-liquid (PLL) form over all doping levels [2]. Here with careful analysis of the intrinsic line shape of Angle-resolved photoemission (ARPES) dispersion cuts, we report a comparative study of the both ω- and T- dependent scattering rate of (Pb)Bi2Sr2CaCu2O8+δ, La2-xSrxCuO4, as well as the copper-free perovskite superconductor Sr2RuO4. With a unified power-law-liquid form of the imaginary self-energy proposed by Reber et al [2], our fitted parameters reproduce the strange-metal and fermi-liquid-like behavior of the cuprate superconductors and Sr2RuO4, respectively. Surprisingly, we show a much stronger electronic coupling parameter for the scattering in the ruthenates compared to the cuprates, indicating another key difference between these different superconductors.

*We are grateful for the funding from the Department of Energy, and the Gordon and Betty Moore Foundation.We greatly appreciate the experimental support from beamline scientists: Makoto Hashimoto & Donghui Lu at Stanford Synchrotron Radiation Lightsource(SSRL) 5-2, and Timur Kim at Diamond Light Source I05.

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Publication: [1] C. M. Varma, P. B. Littlewood, S. Schmitt-Rink, E. Abrahams, "Phenomenology of the normal state of Cu-O high-temperature superconductors." PhysRevLett 63,1996 (1989).
[2] T. J. Reber, X. Zhou, D. S. Dessau et al. "A unified form of low-energy nodal electronic interactions in hole-doped cuprate superconductors", Nature Communications 10, 5737 (2019), 1509.01611.

Presenters

  • Peipei Hao

    • University of Colorado Boulder

Authors

  • Peipei Hao

    • University of Colorado Boulder

  • Haoxiang Li

    • The Hong Kong University of Science and Technology (GZ)
    • The Hong Kong University of Science and Technology (Guangzhou)

  • Dushyant M Narayan

    • University of Colorado, Boulder
    • Department of Physics, University of Colorado Boulder

  • Rafal Kurleto

    • University of Colorado, Boulder
    • Department of Physics, University of Colorado Boulder

  • Bryan S Berggren

    • Department of Physics, University of Colorado Boulder

  • Andrew G Linn

    • Department of Physics

  • Amanda Shackelford

    • University of Colorado, Boulder
    • Department of Physics, University of Colorado Boulder

  • Yu Zhang

    • Department of Physics, University of Colorado Boulder

  • Hope Whitelock

    • University of Colorado Boulder
    • Department of Physics, University of Colorado Boulder

  • Gang Cao

    • University of Colorado Boulder

  • Daniel S Dessau

    • University of Colorado, Boulder
    • University of Colorado-Denver
    • University of Colorado
    • Department of Physics, University of Colorado Boulder