Pairing and spin gap in the normal state of short coherence length superconductors

Mohit Randeria; Nandini Trivedi; Adriana Moreo; Richard T. Scalettar

doi:10.1103/PhysRevLett.69.2001

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Pairing and spin gap in the normal state of short coherence length superconductors

Mohit Randeria, Nandini Trivedi, Adriana Moreo, Richard T. Scalettar

DOI 10.1103/PhysRevLett.69.2001 · Physical Review Letters

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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 Tc, and the normal state of a short coherence length superconductor deviates from a canonical Fermi liquid. In the intermediate U regime, the spin susceptibility χs is strongly temperature dependent, and the low-frequency spectral weight, as measured by the NMR relaxation rate 1/T1T, is shown to track χs. This provides a simple, qualitative explanation for the spin-gap behavior observed in several high-Tc systems.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown