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- W68540981 abstract "Electronic Excitations in Lanthanum Cuprates Measured by Resonant Inelastic X-ray Scattering David Shai Ellis Doctor of Philosophy Graduate Department of Physics University of Toronto 2010 Excitations of the valence electrons in the high-temperature superconducting cuprate La2−xSrxCuO4 were measured by Resonant Inelastic X-ray Scattering (RIXS). Several types of electronic excitations resonant at the Cu 1s →4p transition were studied over a wide range of dopings 06 x 6 0.35. A 500 meV excitation was observed at a reduced momentum transfer q=(π 0) corresponding to the zone boundary, whose temperature and doping dependence was the same as the two-magnon Raman scattering mode. The momentum dependence of this 2-magnon excitation agrees with recent theoretical calculations. Momentum resolved measurements of the x=0 sample revealed a broad range of excitations above and below the main charge transfer peak, and their dispersions were measured across the Brillouin zone. These include a dispersionless ∼1.8 eV peak, which is either a local crystal field (d-d excitation) or dipole-forbidden charge transfer excitation, and a dispersive 2.2 eV peak identified as a Zhang-Ng type charge-transfer exciton. The 2.2 eV peak was less dispersive than predicted from the theoretical models, due to electron-phonon coupling, as illustrated by the temperature dependent shift in the peak position." @default.
- W68540981 created "2016-06-24" @default.
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- W68540981 date "2010-04-15" @default.
- W68540981 modified "2023-09-23" @default.
- W68540981 title "Electronic Excitations in Lanthanum Cuprates Measured by Resonant Inelastic X-ray Scattering" @default.
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