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- W1666179067 abstract "To study the detailed structure of the magnetic excitation spectrum, we performed a neutron scattering experiment on optimally electron-doped Pr 0.89 LaCe 0.11 CuO4 ( T c = 25.5 K). Well-defined spin excitations existed up to an energy of ω∼180 meV, which is consistent with the recent observation by Wilson et al. [Phys. Rev. Lett. 96 (2006) 157001] for the same cuprate with a different T c . Better statistics in our experiment revealed a more precise structure of the spectrum. As the energy increased up to ω c ∼60 meV, the peak width (κ) markably increased, but in the high-energy region beyond ω c the width remained nearly independent of the energy. χ ′′ (ω) showed a sharp peak at ω= 6 meV, which markably diminished as the energy increased until eventually a well-defined magnetic signal was not observed near ω c . However, a broad magnetic peak at (π, π) reappeared beyond ω∼100 meV. We discuss the nature of the spin excitation spectrum, which is vastly different from that of a conventional spin wave excitation with localized spins." @default.
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- W1666179067 date "2006-09-15" @default.
- W1666179067 modified "2023-10-09" @default.
- W1666179067 title "Novel Spin Excitations in Optimally Electron-Doped Pr0.89LaCe0.11CuO4" @default.
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- W1666179067 doi "https://doi.org/10.1143/jpsj.75.093704" @default.
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