Evidence for a metallic–like state in the T=0 K phase diagram of a high temperature superconductor

  • A. A. Schmidt
  • J. J. Rodríguez-Núñez
  • I. Ţifrea
Solid and Condensed State Physics


We examine the effects of a phenomenological pseudogap on the T=0 K phase diagram of a high temperature superconductor within a self-consistent model which exhibits a d-wave pairing symmetry. At the mean-field level the presence of a pseudogap in the normal phase of the high temperature superconductor is proved to be essential for the existence of a metallic–like state in the density versus interaction phase diagram. In the small density limit, at high attractive interaction, bosonic–like degrees of freedom are likely to emerge. Our result should be relevant for underdoped high temperature superconductors, where there is a strong evidence for the presence of a pseudogap in the excitation spectrum of the normal state quasiparticles.


Neural Network Phase Diagram Normal State Complex System Strong Evidence 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. For a recent review, see T. Timusk, B. Statt, Rep. Prog. Phys. 62, 61 (1999) CrossRefGoogle Scholar
  2. A. Damascelli, Z. Hussain, Z.X. Shen, Rev. Mod. Phys. 75, 473 (2003) CrossRefGoogle Scholar
  3. Ch. Renner, B. Revaz, J.-Y. Genoud, K. Kadowaki, O. Fischer, Phys. Rev. Lett. 80, 149 (1999) CrossRefGoogle Scholar
  4. J.L. Tallon, J.W. Loram, Physica C 349, 53 (2001); J.L. Tallon, J.W. Loram, J.R. Cooper, C. Panagopoulos, C. Bernhard, Phys. Rev. B 68, R180501 (2003) Google Scholar
  5. M. Randeria, in Proceedings of the International School of Physics “Enrico Fermi”, edited by G. Iadonisi et al. (IOS, Amsterdam, 1998) Google Scholar
  6. P. Pieri, G.C. Strinati, Phys. Rev. B 61, 15370 (2000) CrossRefGoogle Scholar
  7. B. Janko, J. Maly, K. Levin, Phys. Rev. B 56, R11407 (1997) Google Scholar
  8. J. Schmalian, D. Pines, B. Stojković, Phys. Rev. Lett. 80, 3839 (1998) CrossRefGoogle Scholar
  9. P.A. Lee, Physica C 317318, 194 (1999) Google Scholar
  10. C. Castellani, C. di Castro, M. Grilli, Phys. Rev. Lett. 75, 4650 (1995) CrossRefPubMedGoogle Scholar
  11. A. Perali, C. Castellani, C. di Castro, M. Grilli, Phys. Rev. B 54, 16216 (1996) CrossRefGoogle Scholar
  12. D.M. Eagles, Phys. Rev. 186, 456 (1969) CrossRefGoogle Scholar
  13. A.J. Leggett, J. Phys. Colloq. France 41, C7-19 (1980) Google Scholar
  14. P. Nozières, S. Schmitt–Rink, J. Low Temp. Phys. 59, 195 (1985) CrossRefGoogle Scholar
  15. M. Randeria, in Bose–Einstein Condensation, edited by A. Griffing, D.W. Snoke, S. Stringari (Cambridge University Press, Cambridge, 1995) and the references therein Google Scholar
  16. I. Ţifrea, I. Grosu, M. Crisan, Physica C 371, 104 (2002) Google Scholar
  17. L.P. Gorkov, Sov. Phys. JETP 9, 1364 (1959) Google Scholar
  18. I. Ţifrea, C.P. Moca, Eur. Phys. J. B 5, 33 (2003) Google Scholar
  19. N. Andrenaci, A. Perali, P. Pieri, G.C. Strinat, Phys. Rev. B 60, 12410 (1999) CrossRefGoogle Scholar
  20. B.C. den Hertog, Phys. Rev. B 60, 559 (1999) CrossRefGoogle Scholar
  21. M.B. Soares, F. Kokubun, J.J. Rodríguez–Núñez, O. Rendón, Phys. Rev. B 65, 174506 (2002) CrossRefGoogle Scholar
  22. K.A. Musaelian, J. Betouras, A.V. Chubukov, R. Joynt, Phys. Rev. B 53, 3598 (1996) CrossRefGoogle Scholar
  23. V.N. Popov, Functional Integrals and Collective Excitations (Cambridge University Press, Cambridge, 1987) Google Scholar

Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Authors and Affiliations

  • A. A. Schmidt
    • 1
  • J. J. Rodríguez-Núñez
    • 2
  • I. Ţifrea
    • 3
  1. 1.Departamento de Matemática, CCNEUniversidade Federal de Santa MariaSanta MariaBrazil
  2. 2.Departamento de Fisica-FACYTUniversidad de CaraboboValenciaVenezuela
  3. 3.Department of Theoretical PhysicsUniversity of ClujClujRomania

Personalised recommendations