Doping dependence of phonon anomalies in (Bi,Pb)<sub>2</sub>(Sr,La)<sub>2</sub>CuO<sub>6</sub> revealed by inelastic X-ray scattering

ORAL

Abstract

While charge modulations are ubiquitous in high-temperature superconducting cuprates, understanding their coupling to phonons can provide crucial insight into the role of electron-phonon interactions in high-temperature superconductivity. Here, we have used high-resolution inelastic X-ray scattering to study the doping dependence of the low-energy phonons in the monolayer cuprate (Bi,Pb)2(Sr,La)2CuO6+d, from heavily underdoped (p=0.03) to overdoped (p=0.21) samples. We observe that the longitudinal acoustic phonon along the Cu-O bond direction exhibits a line-shape broadening near the wave vector ~ 0.25 rlu in underdoped samples even when charge order is suppressed, while no broadening occurs in the overdoped samples. Surprisingly, an additional low energy mode around 4 meV is observed in the underdoped samples and is absent in overdoped materials. The origin of the longitudinal phonon broadening and the new low energy mode will be discussed especially in relation to charge order.

*This work was supported by DOE grant DE-FG02-06ER46285.

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Presenters

  • Yingying Peng

    • University of Illinois at Urbana-Champaign

Authors

  • Yingying Peng

    • University of Illinois at Urbana-Champaign

  • Ali Husain

    • University of Illinois at Urbana-Champaign
    • Department of Physics and Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign
    • Physics, University of Illinois at Urbana-Champaign

  • Sangjun Lee

    • University of Illinois at Urbana-Champaign
    • University of Illinois, Urbana-Champaign
    • University of Illinois Urbana-Champaign

  • Ahmet Alatas

    • Argonne National Laboratory
    • Argonne Natl Lab
    • Advanced Photon Source, Argonne National Laboratory

  • Kittihat Krongchon

    • University of Illinois at Urbana-Champaign

  • Xiaolan Sun

    • University of Illinois at Urbana-Champaign

  • Ayman Said

    • Argonne National Laboratory
    • Argonne Natl Lab
    • Advanced Photon Source, Argonne National Laboratory

  • Ying Ding

    • Institute of Physics, Chinese Academy of Sciences
    • Chinese Academy of Sciences

  • Xingjiang Zhou

    • Chinese Academy of Sciences (CAS)
    • Institute of Physics, Chinese Academy of Sciences
    • National Laboratory for Superconductivity (NLSC), Institute of Physics, CAS
    • Chinese Academy of Sciences
    • The Chinese Academy of Sciences, Institute of physics

  • Lucas Wagner

    • Department of Physics, University of Illinois at Urbana-Champaign
    • University of Illinois at Urbana-Champaign
    • Physics, University of Illinois Urbana-Champaign
    • Department of Physics, University of Illinois at Urbana Champaign

  • Peter Abbamonte

    • University of Illinois, Urbana-Champaign
    • University of Illinois at Urbana-Champaign
    • Department of Physics and Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign