Charge Excitations in Electron-Doped Cuprate Superconductors

ORAL

Abstract

The origin and universality of highly dispersive excitations near the zone center reported in the electron-doped cuprate Nd2-xCexCuO4 are still open questions. To tackle these questions, we have performed momentum-resolved resonant inelastic soft x-ray scattering (RIXS) experiments at the Cu L3-edge with ultrahigh energy resolution on another family of electron-doped compounds La2-xCexCuO4 (x=0.11, 0.15, and 0.18). Corresponding highly dispersive excitations are detected, indicating the universality of the feature in electron-doped cuprates. A polarization analysis of both incident and outgoing photons allows us to unambiguously unveil the charge nature of the excitations. Further, mapping out the dispersion of the excitation along the high-symmetry directions of reciprocal space reveals intriguing collective charge dynamics.

*This work is supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division, under contract DE-AC02-76SF00515

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Presenters

  • Matthias Hepting

    • Max Planck Institute for Solid State Research
    • SLAC National Accelerator Laboratory

Authors

  • Matthias Hepting

    • Max Planck Institute for Solid State Research
    • SLAC National Accelerator Laboratory

  • Laura Chaix

    • SLAC National Accelerator Laboratory
    • CEA, Centre de Saclay

  • Giacomo Ghiringhelli

    • Politecnico di Milano

  • Yingying Peng

    • University of Illinois at Urbana-Champaign
    • Politecnico di Milano

  • Roberto Fumagalli

    • Politecnico di Milano

  • Lucio Braicovich

    • Politecnico di Milano

  • Brian Moritz

    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
    • SLAC - Natl Accelerator Lab
    • SLAC and Stanford University
    • SLAC National Accelerator Laboratory
    • Stanford Institute for Materials and Energy Sciences, SLAC National Laboratory
    • SIMIS, Stanford University
    • Physics, Stanford University
    • Stanford Univ
    • SIMES, SLAC and Stanford University

  • Edwin Huang

    • Stanford Univ
    • SLAC National Accelerator Laboratory
    • Physics, Stanford University
    • Stanford University

  • Kurt KUMMER

    • ESRF
    • ESRF European Synchrotron Radiation Facility

  • Nicholas Brookes

    • The European Synchrotron
    • ESRF European Synchrotron Radiation Facility
    • ESRF

  • Wei-Cheng Lee

    • Binghamton University
    • Physics, Binghamton Univ
    • Physics, Applied Physics and Astronomy, Binghamton Univ

  • Tarapada Sarkar

    • Univ of Maryland-College Park
    • Center for Nanophysics & Advanced Materials, Univ of Maryland-College Park

  • Richard Greene

    • Univ of Maryland-College Park
    • Center for Nanophysics & Advanced Materials, Univ of Maryland-College Park
    • University of Maryland

  • Zhi-Xun Shen

    • Stanford University
    • SLAC National Accelerator Laboratory
    • SLAC - Natl Accelerator Lab
    • Stanford Univ
    • SIMIS, Stanford University
    • Applied Physics, Stanford Univ
    • Stanford University and SLAC National Accelerator Laboratory
    • Applied Physics, Stanford University

  • Thomas Devereaux

    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
    • Stanford Univ
    • SLAC and Stanford University
    • SLAC National Accelerator Laboratory
    • SLAC - Natl Accelerator Lab
    • Stanford Institute for Materials and Energy Sciences, SLAC National Laboratory
    • Stanford University
    • SIMIS, Stanford University
    • Physics, Stanford University
    • SLAC National Lab and Stanford University
    • SIMES, SLAC and Stanford University

  • Wei-Sheng Lee

    • SLAC National Accelerator Laboratory
    • SLAC - Natl Accelerator Lab