Document Detail

Evidence for ubiquitous strong electron-phonon coupling in high-temperature superconductors.
MedLine Citation:
PMID:  11484045     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Coupling between electrons and phonons (lattice vibrations) drives the formation of the electron pairs responsible for conventional superconductivity. The lack of direct evidence for electron-phonon coupling in the electron dynamics of the high-transition-temperature superconductors has driven an intensive search for an alternative mechanism. A coupling of an electron with a phonon would result in an abrupt change of its velocity and scattering rate near the phonon energy. Here we use angle-resolved photoemission spectroscopy to probe electron dynamics-velocity and scattering rate-for three different families of copper oxide superconductors. We see in all of these materials an abrupt change of electron velocity at 50-80 meV, which we cannot explain by any known process other than to invoke coupling with the phonons associated with the movement of the oxygen atoms. This suggests that electron-phonon coupling strongly influences the electron dynamics in the high-temperature superconductors, and must therefore be included in any microscopic theory of superconductivity.
A Lanzara; P V Bogdanov; X J Zhou; S A Kellar; D L Feng; E D Lu; T Yoshida; H Eisaki; A Fujimori; K Kishio; J I Shimoyama; T Noda; S Uchida; Z Hussain; Z X Shen
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Nature     Volume:  412     ISSN:  0028-0836     ISO Abbreviation:  Nature     Publication Date:  2001 Aug 
Date Detail:
Created Date:  2001-08-02     Completed Date:  2001-08-23     Revised Date:  2003-10-31    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  510-4     Citation Subset:  -    
Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA.
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