Charge-transfer fluctuation, d-wave superconductivity, and the B1g Raman phonon in cuprates

T. P. Devereaux, A. Virosztek, A. Zawadowski

Research output: Contribution to journalArticle

97 Citations (Scopus)

Abstract

The Raman spectrum of the B1g phonon in the superconducting cuprate materials is investigated theoretically in detail in both the normal and superconducting phases, and is contrasted with that of the A1g phonon. A mechanism involving the charge-transfer fluctuation between the two oxygen ions in the CuO2 plane coupled to the crystal field perpendicular to the plane is discussed and the resulting electron-phonon coupling is evaluated. Depending on the symmetry of the phonon, the weight of different parts of the Fermi surface in the coupling is different. This provides the opportunity to obtain information on the superconducting gap function at certain parts of the Fermi surface. The line shape of the phonon is then analyzed in detail both in the normal and superconducting states. The Fano line shape is calculated in the normal state and the change of the linewidth with temperature below Tc is investigated for a dx2-y2 pairing symmetry. Excellent agreement is obtained for the B1g phonon line shape in YBa2Cu3O7.

Original languageEnglish
Pages (from-to)505-514
Number of pages10
JournalPhysical Review B
Volume51
Issue number1
DOIs
Publication statusPublished - 1995

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Fermi surface
Superconductivity
cuprates
line shape
Charge transfer
superconductivity
charge transfer
Fermi surfaces
Linewidth
Raman scattering
symmetry
Ions
Oxygen
oxygen ions
Crystals
crystal field theory
Electrons
Raman spectra
Temperature
electrons

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Charge-transfer fluctuation, d-wave superconductivity, and the B1g Raman phonon in cuprates. / Devereaux, T. P.; Virosztek, A.; Zawadowski, A.

In: Physical Review B, Vol. 51, No. 1, 1995, p. 505-514.

Research output: Contribution to journalArticle

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