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Journal of Superconductivity

, Volume 5, Issue 2, pp 137–142 | Cite as

On the oxygen isotope shift in La2−xSrxCuO4

  • M. Apostol
  • L. Vasiliu-Doloc
  • A. H. Moudden
Article

Abstract

The anomalous oxygen isotope shift observed in the high-temperature superconductors La2−xSrxCuO4 and La2−xBaxCuO4 is discussed within the model of superconductivity in which the apex oxygen vibrations play the major role in the pairing mechanism. We show that the dependence of both the critical temperature and its isotope shifts on the doping level is consistently described within this model. The anomaly occurring in the isotope shift between x = 0.11 andx=0.15 is traced back to the oxygen mass exponent associated with the apex oxygen frequency.

Key words

Superconductivity isotope effect La2−xSrxCuO4 

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Copyright information

© Plenum Publishing Corporation 1992

Authors and Affiliations

  • M. Apostol
    • 1
  • L. Vasiliu-Doloc
    • 1
  • A. H. Moudden
    • 2
    • 3
  1. 1.Department of Theoretical PhysicsInstitute for Atomic PhysicsMagurele-Bucharest MG-6Romania
  2. 2.Laboratoire Léon BrillouinCEA-CNRSGif/YvetteFrance
  3. 3.Laboratoire de Physique des SolidesOrsayFrance

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