Abstract
We study the normal state of the 2D attractive Hubbard model using quantum Monte Carlo simulations. We show that singlet pairing correlations develop above , and the normal state of a short coherence length superconductor deviates from a canonical Fermi liquid. In the intermediate U regime, the spin susceptibility is strongly temperature dependent, and the low-frequency spectral weight, as measured by the NMR relaxation rate 1/T, is shown to track . This provides a simple, qualitative explanation for the spin-gap behavior observed in several high- systems.
- Received 27 May 1992
DOI:https://doi.org/10.1103/PhysRevLett.69.2001
©1992 American Physical Society