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- W103807488 abstract "In this thesis, an investigation of three oxygen dependent optical phonons at 340, 440, and 500 cm-I in the prototype high temperature superconductor YBa2Cu307, is carried out by means of Raman light scattering. The frequency and linewidth shifts in isotopically exchanged samples (180 for 160) suggest that the 340 and 440 cm-1 modes primarily involve a different set of atomic sites than the 500 cm-1 phonon in agreement with the predictions of lattice dynamics models. A linear chain is used to numerically model the 500 cm-1 mode and generate Raman peaks whose isotopic frequency shifts and linewidth changes are in good agreement with the corresponding experimental observations. The temperature dependences of the 340, 440, and 500 cm-I phonons are investigated in YBa2CugOy single crystals with a range of oxygen concentrations (6.7 ,< y I 7.0) and YBa2Cu307 single crystals containing a small amount of thorium. The results indicate that the superconductivity induced self energy shifts in the 340 cm-1 phonon are strongly dependent on the hole concentration. Smaller variations in the superconductivity induced self energy shifts of the 440 and 500 cm-1 phonons are also observed. Superconducting gap energy estimates obtained using strong coupling theories range from 2A = 5.4k~T, in the fully oxygenated samples (y = 7.0) to energies possibly as large as 6.7kBTc in the deoxygenated and hence hole reduced samples. These values for 26 are not entirely consistent with the self energy shifts of the 440 and 500 cm-1 modes, however, suggesting the possible existence of two or more gaps with different symmetries. ... 111" @default.
- W103807488 created "2016-06-24" @default.
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- W103807488 date "1992-01-01" @default.
- W103807488 modified "2023-09-27" @default.
- W103807488 title "A Raman investigation of the Ag oxygen vibrations in yttrium barium copper oxide" @default.
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