Journal of Superconductivity

, Volume 10, Issue 4, pp 355–359 | Cite as

The isotope effect in a superlattice of quantum stripes

  • A. Perali
  • A. Valletta
  • G. Bardeiloni
  • A. Bianconi
  • A. Lanzara
  • N. L. Saint
Article

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 stripes isotope effect superlattice 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    M. Cirot and D. Pavuna,Introduction to Superconductivity and High- T c Materials (World Scientific, Singapore, 1992).Google Scholar
  2. 2.
    M. K. Crawford, M. N. Kunchur, W. E. Farneth, E. M. McCarron, III, and S. J. Poon,Phys. Rev. B 41, 1, 282 (1990).CrossRefGoogle Scholar
  3. 3.
    M. K. Crawford, W. E. Farneth, E. M. McCarron, III, R. L. Harlow, and A. H. Moudden,Science 250, 1390 (1990).CrossRefADSGoogle Scholar
  4. 4.
    J. P. Frank, S. Harker, and J. H. Brewer,Phys. Rev. Lett. 71, 283, 1993; J. P. Franck, J. Jung, G. Salomons, W. A. Miner, M. A. K. Mohamed. J. Chrzanowski, S. Cygax, J. C. Irvin, D. F. Mitchell, and G. I. Sproule,Physica C 172, 90 (1990).CrossRefADSGoogle Scholar
  5. 5.
    J. P. Franck, S. Cygax, G. Soerensen, E. Altshuler, A. Hnatiw; J. Jung, M. A.-K. Mohamed, M. K. Yu, G. I. Sproul, J. Chrzanowski, and J. C. Irwin,Physica C 185-189, 1379 (1991).CrossRefADSGoogle Scholar
  6. 6.
    D. Zech, H. Keller, K. Condor, E. Kaldis, E. Liarokapis, N. Poulakis, and K. A. Müller,Nuture 371, 681 (1994).CrossRefADSGoogle Scholar
  7. 7.
    V. Z. Kresin and S. A. Wolf,Phys. Rev. B 49, 3652 (1994).CrossRefADSGoogle Scholar
  8. 8.
    J. P. Carbotte, M. Greeson, and A. P. Gonzalez,Phys. Rev. Lett. 66, 1789 (1991).CrossRefADSGoogle Scholar
  9. 9.
    A. S. Alexandrov,Phys. Rev. B 46, 14932 (1992).CrossRefADSGoogle Scholar
  10. 10.
    A. Yu. Cherny and T. Galbaatar,Physica C 210, 35 (1993).CrossRefADSGoogle Scholar
  11. 11.
    C. Wiccko,Physiea C 269, 286 (1996).CrossRefADSGoogle Scholar
  12. 12.
    C. C. Tsuei, D. M. Newns, C. C. Chi, and P. C. Pattnaik,Phys. Rev. Lett. 65, 2724 (1990).CrossRefADSGoogle Scholar
  13. 13.
    D. M. News, C. C. Tsuei, and P. C. Pattnaik,Phys. Rev. B 52, 13611 (1995).CrossRefADSGoogle Scholar
  14. 14.
    R. Kishore,Physica C 253, 367 (1995).CrossRefADSGoogle Scholar
  15. 15.
    A. Bianconi, N. L. Saini, T. Rossetti, A. Lanzara, A. Perali, M. Misson, H. Oyanaui, H. Yamaszuchi, Y. Nishihara, and D. H. Ha,Phys. Rev. B 54, 12018 (1996).CrossRefADSGoogle Scholar
  16. 16.
    A. Bianconi, M. Lusignoli, N. L. Saini, P. Bordet, A. Kvick, and P. G. Radaelli,phys. Rev. B 54, 4310 (1996).CrossRefADSGoogle Scholar
  17. 17.
    A. Bianconi, N. L. Saini, A. Lanzara, M. Missori, T. Rossetti, H. Oyanagi, H. Yamaguchi, K. Oka, and T. Ito,Phvs. Rev. Lett. 76, 3412 (1996).CrossRefADSGoogle Scholar
  18. 18.
    A. Lanzara, N. L. Saini, A. Bianconi, J. L. Hazemann, Y. Soldo, F. C. Chou, and D. C. Johnston,Phys. Rev. B 55, 9120 (1997).CrossRefADSGoogle Scholar
  19. 19.
    A. Perali, A. Bianconi, A. Lanzara, and N. L. Saini,Solid Suite Commun. 100, 181, (1996).CrossRefGoogle Scholar
  20. 20.
    A. Bianconi, A. Valletta, A. Perali, and N. L. Saini,Solid. Suite Commun. 102, 365 (1997).CrossRefGoogle Scholar

Copyright information

© Plenum Publishing Corporation 1997

Authors and Affiliations

  • A. Perali
    • 1
  • A. Valletta
    • 1
  • G. Bardeiloni
    • 1
  • A. Bianconi
    • 1
  • A. Lanzara
    • 1
  • N. L. Saint
    • 2
  1. 1.Dipartimento di FisicaUniversitá di Roma “ La Sapienza”RomaItaly
  2. 2.Dipartimento di FisicaIstituto Nazionale di Fisica NucleareRomaItaly

Personalised recommendations