Abstract
The magnetic excitation spectra, determined by inelastic neutron scattering, of the electron superconductor Pr 1.85Ce 0.15CuO 4 are compared with those of the parent insulating compound Pr 2CuO 4. The observed crystal-field transitions in the superconducting material shift to slightly lower energies and are broadened significantly relative to those from the parent compound. The results are consistent with the crystal-field model calculation for the splitting of the Pr 3+: 3H 4 ground multiplet under the scheme of intermediate coupling. High-resolution neutron spectroscopy reveals that the Ce ions in Pr 1.85Ce 0.15CuO 4 are nonmagnetic and the Ce 4f-electrons are likely to be delocalized into the conduction band.
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