Physical origin of the buckling in CuO2: Electron-phonon coupling and Raman spectra

M. Opel, R. Hackl, T. P. Devereaux, A. Virosztek, A. Zawadowski, A. Erb, E. Walker, H. Berger, and L. Forró
Phys. Rev. B 60, 9836 – Published 1 October 1999
PDFExport Citation

Abstract

It is shown theoretically that the buckling of the CuO2 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 (B1g mode) to the electronic charge transfer between the two oxygens in the CuO2 plane. Consequently, the electric field can be deduced from the Fano-type line shape of the B1g 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 YBa2Cu3O6+x and Bi2Sr2(CaxY1x)Cu2O8 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.

  • Received 1 December 1998

DOI:https://doi.org/10.1103/PhysRevB.60.9836

©1999 American Physical Society

Authors & Affiliations

M. Opel and R. Hackl

  • Walther Meissner Institut, Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany

T. P. Devereaux*

  • Department of Physics, The George Washington University, Washington, DC 20052

A. Virosztek and A. Zawadowski

  • Institute of Physics and Research Group of the Hungarian Academy of Sciences, Technical University of Budapest, H-1521 Budapest, Hungary
  • Research Institute for Solid State Physics, P.O. Box 49, H-1525 Budapest, Hungary

A. Erb and E. Walker

  • DPMC, Université de Genève, CH-1211 Genève, Switzerland

H. Berger and L. Forró

  • EPFL, Ecublens, CH-1015 Lausanne, Switzerland

  • *Present address: Dept. of Physics, University of Waterloo, Waterloo, ON.

References (Subscription Required)

Click to Expand
Issue

Vol. 60, Iss. 13 — 1 October 1999

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×