Abstract
A systematic Raman study in the visible carried out on the YBa2Cu3 16, 18Ox (x = 6–7) compounds, with isotopic substitution of 18O for 16O, has detected a doping dependent deviation from harmonic behavior for the frequency shift of the in-phase mode, a smaller amount of anharmonicity for the apex mode, and almost no effect for the out-of-phase B1g-symmetry phonon. It appears that the amount of anharmonicity depends strongly on the oxygen concentration; it diminishes close to the tetragonal to orthorhombic structural phase transition and close to optimal doping, while it reaches its maximum value for the ortho-II and a tetragonal phase. The almost zero anharmonicity at optimal doping persists even at 77 K. The data in the overdoped oxygen concentration, where a softening of the in-phase phonon frequency occurs, indicate that the anharmonicity is not enhanced by the sudden increase in the CuO2 buckling. The results fully agree with recent studies of the ortho-II phase but they do not comply with a static double-well potential of the apical oxygen atom at optimal doping.
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Acknowledgments
I would like to thank Prof. Dr. K.A. Müller who had proposed this experimental Raman study, Prof. Dr. E. Kaldis and Dr. K. Conder who provided the excellent quality samples, and Dr. N. Poulakis and Dr. D. Palles who had carried out the time consuming Raman measurements.
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Liarokapis, E. (2017). Raman Study of the Anharmonicity in YBa2Cu3Ox . In: Bussmann-Holder, A., Keller, H., Bianconi, A. (eds) High-Tc Copper Oxide Superconductors and Related Novel Materials. Springer Series in Materials Science, vol 255. Springer, Cham. https://doi.org/10.1007/978-3-319-52675-1_15
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