Journal of Superconductivity

, Volume 10, Issue 4, pp 355–359

The isotope effect in a superlattice of quantum stripes

Authors

  • A. Perali
    • Dipartimento di FisicaUniversitá di Roma “ La Sapienza”
  • A. Valletta
    • Dipartimento di FisicaUniversitá di Roma “ La Sapienza”
  • G. Bardeiloni
    • Dipartimento di FisicaUniversitá di Roma “ La Sapienza”
  • A. Bianconi
    • Dipartimento di FisicaUniversitá di Roma “ La Sapienza”
  • A. Lanzara
    • Dipartimento di FisicaUniversitá di Roma “ La Sapienza”
  • N. L. Saint
    • Dipartimento di FisicaIstituto Nazionale di Fisica Nucleare
Article

DOI: 10.1007/BF02765718

Cite this article as:
Perali, A., Valletta, A., Bardeiloni, G. et al. J Supercond (1997) 10: 355. doi:10.1007/BF02765718

Abstract

We have calculated the isotope effect coefficient and the critical temperature in a particular superconducting heterostructure formed by a bidimensional (2D) superlattice of metallic quantum stripes. We model the superlattice with a 2D free electron gas confined in a ID periodic potential barrier. Within the BCS theory we calculate the shape resonance for the critical temperature and the isotope coefficient as a function of the chemical potential. The results provide a good description of the anomalous behavior of the isotope coefficient in La{2-x}SrxCuO4 as a function of doping with a sharp peak α ~0.8 in the underdoped regime and a rapid drop to α ~0.2 at 0.125 holes per copper site.

Key Words

Quantum stripesisotope effectsuperlattice

Copyright information

© Plenum Publishing Corporation 1997