Raman-active phonons in Bi2Sr2-xLaxCuO6+d

Phonon assignment and charge-redistribution effects

Minoru Osada, Masato Kakihana, Mikael Käll, Lars Börjesson, Atsuyoshi Inoue, Masatomo Yashima

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Phonon Raman spectra of Bi2Sr2-xLaxCuO6+d single crystals with x values close to 0, 0.4, and 0.8 have been investigated. Room-temperature measurements were performed in the five main polarization geometries, including the c-axis polarized configuration. We identify the 4A1g symmetry modes that are Raman allowed within the ideal body-centered-tetragonal unit cell, as well as several disorder activated phonon bands from the BiO and/or SrO layers. For an increasing degree of La doping, the O(2)Sr A1g mode at 624 cm-1 softens by 12 cm-1 between x=0 and x=0.8. We attribute this softening to a weakening of the Cu-O(2)Sr-Bi bond due to a reduction in Cu and Bi valences when going from the overdoped (x=0) to the underdoped (x=0.8) regime.

Original languageEnglish
Pages (from-to)2847-2851
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume56
Issue number5
Publication statusPublished - 1997 Aug 1
Externally publishedYes

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Phonons
Temperature measurement
Raman scattering
phonons
Doping (additives)
Single crystals
Polarization
Geometry
softening
temperature measurement
disorders
Raman spectra
valence
single crystals
symmetry
room temperature
polarization
geometry
configurations
cells

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Osada, M., Kakihana, M., Käll, M., Börjesson, L., Inoue, A., & Yashima, M. (1997). Raman-active phonons in Bi2Sr2-xLaxCuO6+d: Phonon assignment and charge-redistribution effects. Physical Review B - Condensed Matter and Materials Physics, 56(5), 2847-2851.

Raman-active phonons in Bi2Sr2-xLaxCuO6+d : Phonon assignment and charge-redistribution effects. / Osada, Minoru; Kakihana, Masato; Käll, Mikael; Börjesson, Lars; Inoue, Atsuyoshi; Yashima, Masatomo.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 56, No. 5, 01.08.1997, p. 2847-2851.

Research output: Contribution to journalArticle

Osada, M, Kakihana, M, Käll, M, Börjesson, L, Inoue, A & Yashima, M 1997, 'Raman-active phonons in Bi2Sr2-xLaxCuO6+d: Phonon assignment and charge-redistribution effects', Physical Review B - Condensed Matter and Materials Physics, vol. 56, no. 5, pp. 2847-2851.
Osada, Minoru ; Kakihana, Masato ; Käll, Mikael ; Börjesson, Lars ; Inoue, Atsuyoshi ; Yashima, Masatomo. / Raman-active phonons in Bi2Sr2-xLaxCuO6+d : Phonon assignment and charge-redistribution effects. In: Physical Review B - Condensed Matter and Materials Physics. 1997 ; Vol. 56, No. 5. pp. 2847-2851.
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