Fine structure in the tunneling spectra of electron-doped cuprates: No coupling to magnetic resonance mode

Abstract

We analyze high-resolution scanning tunneling spectra of the electron-doped cuprate Pr0.88LaCe0.12CuO4 (T_c = 24 K). We find that the spectral fine structure below 35 meV is consistent with strong coupling to a bosonic mode at 16 meV, in quantitative agreement with early tunneling spectra of Nd1.85Ce0.15CuO4. Since the energy of the bosonic mode is significantly higher than that (9.5-11 meV) of the magnetic resonance-like mode observed by inelastic neutron scattering, the coupling feature at 16 meV cannot arise from strong coupling to the magnetic mode. The present work thus demonstrates that the magnetic resonance-like mode cannot be the origin of high-temperature superconductivity in electron-doped cuprates.

4 pages and 4 figures

References in corpus (9)

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• Resonance in the electron-doped high-Tc superconductor Pr0.88LaCe0.12CuO(4-delta)
• Polaronic behavior of undoped high-Tc cuprates
• Doping dependence of the coupling of electrons to bosonic modes in the single-layer high-temperature Bi2Sr2CuO6 superconductor
• A distinct bosonic mode in an electron-doped high-transition-temperature superconductor
• Resonance in Optimally Electron-Doped Superconductor Nd${}_{1.85}$Ce${}_{0.15}$CuO${}_{4-\delta }$
• The impact of dynamical screening on the phonon dynamics of LaCuO
• Calculation of overdamped c-axis charge dynamics and the coupling to polar phonons in cuprate superconductors
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• Evolution of a bosonic mode across the superconducting dome in the high-Tc cuprate Pr(2-x)Ce(x)CuO(4-δ)
• Phonon Dispersion Relationship and Oxygen Isotope Effect in Superconductor LaFeAsO