Resonance in Optimally Electron-Doped Superconductor Nd${}_{1.85}$Ce${}_{0.15}$CuO${}_{4-\delta }$

Abstract

We use inelastic neutron scattering to probe magnetic excitations of an optimally electron-doped superconductor Nd${}_{1.85}$Ce${}_{0.15}$CuO${}_{4-\delta }$ above and below its superconducting transition temperature $T_c=25$ K. In addition to gradually opening a spin pseudo gap at the antiferromagnetic ordering wavevector $\mathbf{Q}=(1/2,1/2,0)$, the effect of superconductivity is to form a resonance centered also at $\mathbf{Q}=(1/2,1/2,0)$ but at energies above the spin pseudo gap. The intensity of the resonance develops like a superconducting order parameter, similar to those for hole-doped superconductors and electron-doped Pr${}_{0.88}$LaCe${}_{0.12}$CuO${}_4$. The resonance is therefore a general phenomenon of cuprate superconductors, and must be fundamental to the mechanism of high-$T_c$ superconductivity.

arXiv commentFigure 4 typo corrected

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