Dispersion of the high-energy phonon modes in Nd1.85Ce0.15CuO4

M. Braden, L. Pintschovius, T. Uefuji, and K. Yamada
Phys. Rev. B 72, 184517 – Published 23 November 2005

Abstract

The dispersion of the high-energy phonon modes in the electron-doped high-temperature superconductor Nd1.85Ce0.15CuO4 has been studied by inelastic neutron scattering. The frequencies of phonon modes with Cu-O bond-stretching character drop abruptly when going from the Brillouin zone center along the [100] direction; this dispersion is qualitatively similar to observations in the hole-doped cuprates. We also find a softening of the bond-stretching modes along the [110] direction but which is weaker and exhibits a sinusoidal dispersion. The phonon anomalies are discussed in comparison to hole-doped cuprate superconductors and other metallic perovskites.

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  • Received 29 June 2005

DOI:https://doi.org/10.1103/PhysRevB.72.184517

©2005 American Physical Society

Authors & Affiliations

M. Braden1,*, L. Pintschovius2,3, T. Uefuji4, and K. Yamada5

  • 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany
  • 2Forschungszentrum Karlsruhe, Institut für Festkörperphysik, P.O.B. 3640, D-76021 Karlsruhe, Germany
  • 3Laboratoire Léon Brillouin, CE Saclay, F-91191 Gif-sur-Yvette, France
  • 4Institute for Chemical Research, Kyoto University, Uji 611-0011, Japan
  • 5Institute of Materials Research, Tohoku University, Sendai 980-8577, Japan

  • *Electronic address: braden@ph2.uni-koeln.de

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Issue

Vol. 72, Iss. 18 — 1 November 2005

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