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Advances in Condensed Matter Physics
Volume 2010 (2010), Article ID 523549, 24 pages
http://dx.doi.org/10.1155/2010/523549
Review Article

Giant Electron-Phonon Anomaly in Doped and Other Cuprates

1Karlsruher Institut für Technologie (KIT), Institut für Festkörperphysik, Postfach 3640, D-76121 Karlsruhe, Germany
2Department of Physics, University of Colorado, Boulder, Colorado 80309, USA

Received 1 July 2009; Accepted 24 September 2009

Academic Editor: Dragan Mihailovic

Copyright © 2010 D. Reznik. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Since conventional superconductivity is mediated by phonons, their role in the mechanism of high temperature superconductivity has been considered very early after the discovery of the cuprates. The initial consensus was that phonons could not produce transition temperatures near 100 K, and the main direction of research focused on nonphononic mechanisms. Subsequent work last reviewed by L. Pintschovius in 2005 showed that electron-phonon coupling in the cuprates is surprisingly strong for some phonons and its role is controversial. Experiments performed since then identified anomalous behavior of certain Cu–O bond-stretching phonons in cuprates as an important phenomenon that is somehow related to the mechanism of superconductivity. A particularly big advance was made in the study of doped . This work is reviewed here.