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.

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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