Composition dependence of the in-plane Cu-O bond-stretching LO phonon mode in Y Ba2 Cu3 O6+x

F. Stercel, T. Egami, H. A. Mook, M. Yethiraj, Jaiho Chung, M. Arai, C. Frost, F. Dogan

Research output: Contribution to journalArticle

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Abstract

An inelastic pulsed neutron scattering study was performed on the dependence of the dispersion and spectral intensity of the in-plane Cu-O bond-stretching LO phonon mode on doped charge density. The measurements were made in the time-of-flight mode with the multiangle position sensitive spectrometer of the ISIS facility on single crystals of Y Ba2 Cu3 O6+x (x=0.15, 0.35, 0.6, 0.7, and 0.95). The focus of the study is the in-plane Cu-O bond-stretching LO phonon mode, which is known for strong electron-phonon coupling and unusual dependence on composition and temperature. It is shown that the dispersions for the samples with x=0.35, 0.6, and 0.7 are similar to the superposition of those for x=0.15 and 0.95 samples, and cannot be explained in terms of the structural anisotropy. It is suggested that the results are consistent with the model of nanoscale electronic phase separation, with the fraction of the phases being dependent on the doped charge density.

Original languageEnglish
Article number014502
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number1
DOIs
Publication statusPublished - 2008 Jan 4

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Charge density
Stretching
Neutron scattering
Chemical analysis
Dispersions
Phase separation
Spectrometers
Anisotropy
Single crystals
Electrons
neutron scattering
spectrometers
anisotropy
single crystals
electronics
Temperature
electrons
temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Composition dependence of the in-plane Cu-O bond-stretching LO phonon mode in Y Ba2 Cu3 O6+x. / Stercel, F.; Egami, T.; Mook, H. A.; Yethiraj, M.; Chung, Jaiho; Arai, M.; Frost, C.; Dogan, F.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 77, No. 1, 014502, 04.01.2008.

Research output: Contribution to journalArticle

Stercel, F. ; Egami, T. ; Mook, H. A. ; Yethiraj, M. ; Chung, Jaiho ; Arai, M. ; Frost, C. ; Dogan, F. / Composition dependence of the in-plane Cu-O bond-stretching LO phonon mode in Y Ba2 Cu3 O6+x. In: Physical Review B - Condensed Matter and Materials Physics. 2008 ; Vol. 77, No. 1.
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AU - Chung, Jaiho

AU - Arai, M.

AU - Frost, C.

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