Physical origin of the buckling in CuO${}_2$: Electron-phonon coupling and Raman spectra

Abstract

It is shown theoretically that the buckling of the CuO${}_2$ planes in certain cuprate systems can be explained in terms of an electric field across the planes which originates from different valences of atoms above and below the plane. This field results also in a strong coupling of the Raman-active out-of-phase vibration of the oxygen atoms ($B_{1g}$ mode) to the electronic charge transfer between the two oxygens in the CuO${}_2$ plane. Consequently, the electric field can be deduced from the Fano-type line shape of the $B_{1g}$ phonon. Using the electric field estimated from the electron-phonon coupling the amplitude of the buckling is calculated and found to be in good agreement with the structural data. Direct experimental support for the idea proposed is obtained in studies of YBa${}_2$Cu${}_3$O${}_{6+x}$ and Bi${}_2$Sr${}_2$(Ca${}_{1-x}$Y${}_x$)Cu${}_2$O${}_8$ with different oxygen and yttrium doping, respectively, including antiferromagnetic samples. In the latter compound, symmetry breaking by replacing Ca partially by Y leads to an enhancement of the electron-phonon coupling by an order of magnitude.

12 pages, 4 figures, and 1 table

References in corpus (4)

• A Displacive Structural Transformation in the CuO_2 Planes of YBa_2Cu_3O_x at the Underdoped-Overdoped Phase Separation Line
• Out-of-plane instability and electron-phonon contribution to s- and d-wave pairing in high-temperature superconductors; LDA linear-response calculation for doped CaCuO2 and a generic tight-binding model
• Theory of Electronic Raman Scattering in Nearly Antiferromagnetic Fermi Liquids
• Enhanced Electron-Phonon Coupling and its Irrelevance to High T${}_c$ Superconductivity

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