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Phonon Dispersions and Phonon Density-of-States in Copper-Oxide Superconductors

  • Chapter
Neutron Scattering in Layered Copper-Oxide Superconductors

Part of the book series: Physics and Chemistry of Materials with Low-Dimensional Structures ((PCMALS,volume 20))

Abstract

The discovery of high Tc superconductivity in the cuprates by Bednorz and Müller (1986) has stimulated a large number of inelastic neutron scattering experiments to explore the phonon properties of these compounds. Most of these studies were searching for electron-phonon coupling effects and thus to clarify whether or not phonons play an important role for high Tc superconductivity. Herefore, it was indispensable to study not only the superconducting members of the cuprate family, but also the insulating parent compounds, because electron-phonon coupling effects can be identified as such only when having a firm knowledge of the normal lattice dynamical properties. Phonon studies have been performed both on single crystalline and on po-lycrystalline samples. As has been outlined in section 8.2. of the first chapter in this volume by Boni and Furrer, single crystals are indispensable for determining the dispersion curves of the phonons, ω = ωs(q). whereby the branch index s = 1...3N with N the number of atoms in the unit cell. Because all the cuprate superconductors have fairly complex structures with N = 7 or larger, the phonon dispersion contains many branches which cannot be assigned to the observed maxima in the neutron scattering cross-section by rules of thumb.

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Authors and Affiliations

  1. Institut für Nukleare Festkörperphysik, Forschungszentrum Karlsruhe, P.O.Box 3640, D-76021, Karlsruhe, Germany

    Lothar Pintschovius & Winfried Reichardt

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  1. Lothar Pintschovius
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  2. Winfried Reichardt
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  1. Laboratory for Neutron Scattering, ETH Zurich & Paul Scherrer Institute, Villigen PSI, Switzerland

    Albert Furrer

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© 1998 Kluwer Academic Publishers

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Pintschovius, L., Reichardt, W. (1998). Phonon Dispersions and Phonon Density-of-States in Copper-Oxide Superconductors. In: Furrer, A. (eds) Neutron Scattering in Layered Copper-Oxide Superconductors. Physics and Chemistry of Materials with Low-Dimensional Structures, vol 20. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-1284-8_5

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  • DOI: https://doi.org/10.1007/978-94-015-1284-8_5

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