Phys. Rev. Lett. 99, 017001 (2007) [4 pages]Neutron-Spin Resonance in the Optimally Electron-Doped Superconductor Nd1.85Ce0.15CuO4-δReceived 27 March 2007; published 5 July 2007 We use inelastic neutron scattering to probe magnetic excitations of an optimally electron-doped superconductor Nd1.85Ce0.15CuO4-δ above and below its superconducting transition temperature Tc=25 K. In addition to gradually opening a spin pseudogap at the antiferromagnetic ordering wave vector Q=(1/2,1/2,0), the effect of superconductivity is to form a resonance centered also at Q=(1/2,1/2,0) but at energies above the spin pseudogap. The intensity of the resonance develops like a superconducting order parameter, similar to those for hole-doped superconductors and electron-doped Pr0.88LaCe0.12CuO4. The resonance is therefore a general phenomenon of cuprate superconductors, and must be fundamental to the mechanism of high-Tc superconductivity. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.017001
DOI:
10.1103/PhysRevLett.99.017001
PACS:
74.72.Jt, 61.12.Ld, 75.25.+z
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