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


The temperature scaleT* at which the amplitude of the order parameter is formed is in general much higher than theT c 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 rangeT c <T<T*. We find thatχ s 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∼χ s (T) characteristic of spin gap behavior in the high-T c materials.

Key words

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


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Copyright information

© Plenum Publishing Corporation 1996

Authors and Affiliations

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

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