In-plane anisotropy and temperature dependence of oxygen phonon modes in (formula presented)

T. Yokoo, H. A. Mook, Jaiho Chung, T. Egami, R. J. McQueeney, M. Yethiraj, M. Arai, Y. Petrov, Y. Endoh, S. Tajima, C. Frost, F. Dogan

Research output: Contribution to journalArticle

Abstract

Inelastic pulsed neutron scattering measurements on (formula presented) single crystals indicate that the sample has a distinct a-(formula presented) plane anisotropy in the oxygen vibrations. The Cu-O bond-stretching-type phonons, which are suspected to interact strongly with charge, are simultaneously observed along the a and b directions due to a 7-meV splitting arising from the orthorhombicity, even though the sample is twinned. The bond-stretching LO branch with the polarization along a (perpendicular to the chain) loses intensity beyond the middle of the zone, indicating branch splitting as seen in doped nickelates, with the second branch being located at 10 meV below. The mode along b has a continuous dispersion. These modes show temperature dependence, which parallels that of superconductive order parameter, suggesting significant involvement of phonons in the superconductivity of this compound.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number1
DOIs
Publication statusPublished - 2003 Jan 1
Externally publishedYes

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Phonons
Stretching
phonons
Anisotropy
Oxygen
temperature dependence
anisotropy
oxygen
Neutron scattering
Superconductivity
neutron scattering
superconductivity
Single crystals
Polarization
vibration
Temperature
single crystals
polarization
Direction compound

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

In-plane anisotropy and temperature dependence of oxygen phonon modes in (formula presented). / Yokoo, T.; Mook, H. A.; Chung, Jaiho; Egami, T.; McQueeney, R. J.; Yethiraj, M.; Arai, M.; Petrov, Y.; Endoh, Y.; Tajima, S.; Frost, C.; Dogan, F.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 67, No. 1, 01.01.2003.

Research output: Contribution to journalArticle

Yokoo, T, Mook, HA, Chung, J, Egami, T, McQueeney, RJ, Yethiraj, M, Arai, M, Petrov, Y, Endoh, Y, Tajima, S, Frost, C & Dogan, F 2003, 'In-plane anisotropy and temperature dependence of oxygen phonon modes in (formula presented)', Physical Review B - Condensed Matter and Materials Physics, vol. 67, no. 1. https://doi.org/10.1103/PhysRevB.67.014517
Yokoo, T. ; Mook, H. A. ; Chung, Jaiho ; Egami, T. ; McQueeney, R. J. ; Yethiraj, M. ; Arai, M. ; Petrov, Y. ; Endoh, Y. ; Tajima, S. ; Frost, C. ; Dogan, F. / In-plane anisotropy and temperature dependence of oxygen phonon modes in (formula presented). In: Physical Review B - Condensed Matter and Materials Physics. 2003 ; Vol. 67, No. 1.
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AU - Yokoo, T.

AU - Mook, H. A.

AU - Chung, Jaiho

AU - Egami, T.

AU - McQueeney, R. J.

AU - Yethiraj, M.

AU - Arai, M.

AU - Petrov, Y.

AU - Endoh, Y.

AU - Tajima, S.

AU - Frost, C.

AU - Dogan, F.

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AB - Inelastic pulsed neutron scattering measurements on (formula presented) single crystals indicate that the sample has a distinct a-(formula presented) plane anisotropy in the oxygen vibrations. The Cu-O bond-stretching-type phonons, which are suspected to interact strongly with charge, are simultaneously observed along the a and b directions due to a 7-meV splitting arising from the orthorhombicity, even though the sample is twinned. The bond-stretching LO branch with the polarization along a (perpendicular to the chain) loses intensity beyond the middle of the zone, indicating branch splitting as seen in doped nickelates, with the second branch being located at 10 meV below. The mode along b has a continuous dispersion. These modes show temperature dependence, which parallels that of superconductive order parameter, suggesting significant involvement of phonons in the superconductivity of this compound.

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