Journal of Superconductivity

, Volume 9, Issue 1, pp 13–16 | Cite as

Normal state of short coherence length superconductors: Qualitative differences between spin and charge correlations

  • Nandini Trivedi
  • Mohit Randeria
Article

Abstract

The temperature scaleT* at which the amplitude of the order parameter is formed is in general much higher than theTc at which phase coherence is established in short coherence length superconductors. Using quantum Monte Carlo simulations for the attractive Hubbard model we show that for a degenerate 2D system the spin and charge responses show qualitatively different behavior in the normal state in the temperature rangeTc<T<T*. We find thatχs is stronglyT-dependent whiledn/dμ is independent ofT. A pseudo-gap develops in the one-particle density of states and leads to anomalous behavior of the NMR relaxation rate 1/T1T∼χs(T) characteristic of spin gap behavior in the high-Tc materials.

Key words

Short coherence length superconductor attractive Hubbard model normal-state anomalies Non-Fermi liquid 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    M. Randeria, N. Trivedi, A. Moreo, and R. T. Scalettar,Phys. Rev. Lett. 69, 2001 (1992).Google Scholar
  2. 2.
    N. Trivedi and M. Randeria (preprint).Google Scholar
  3. 3.
    R. T. Scalettaret al., Phys. Rev. Lett. 62, 1407 (1989); A. Moreo and D. J. Scalapino,Phys. Rev. Lett. 66, 946 (1991).Google Scholar
  4. 4.
    C. Sa de Melo, M. Randeria, and J. R. Engelbrecht,Phys. Rev. Lett. 71, 3202 (1993). For a detailed review and references on the BCS-Bose crossover, see M. Randeria, inBose-Einstein Condensation, edited by A. Griffin, D. Snoke, and S. Stringari (Cambridge University Press, 1995).Google Scholar
  5. 5.
    W. W. Warrenet al., Phys. Rev. Lett. 62, 1193 (1989); M. Takigawaet al., Phys. Rev. B 43, 247 (1991); H. Alloulet al., Phys. Rev. Lett. 70, 1171 (1993); R. E. Walstedtet al., Phys. Rev. Lett. 72, 3610 (1994).Google Scholar

Copyright information

© Plenum Publishing Corporation 1996

Authors and Affiliations

  • Nandini Trivedi
    • 1
  • Mohit Randeria
    • 1
  1. 1.Materials Science Division, Bldg. 223Argonne National LaboratoryArgonne

Personalised recommendations