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

Journal Article · Mon Sep 28 04:00:00 EDT 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.69.2001· OSTI ID:6996455

Randeria, M; Trivedi, N; Moreo, A; Scalettar, R T ^[1]

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1. Materials Science Division 223, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States) Department of Physics and Center for Materials Research and Technology, Florida State University, Tallahassee, Florida 32306 (United States) Department of Physics, University of California, Davis, California 95616 (United States)

We study the normal state of the 2D attractive Hubbard model using quantum Monte Carlo simulations. We show that singlet pairing correlations develop above {ital T}{sub {ital c}}, and the normal state of a short coherence length superconductor deviates from a canonical Fermi liquid. In the intermediate {ital U} regime, the spin susceptibility {chi}{sub {ital s}} is strongly temperature dependent, and the low-frequency spectral weight, as measured by the NMR relaxation rate 1/{ital T}{sub 1}{ital T}, is shown to track {chi}{sub {ital s}}. This provides a simple, qualitative explanation for the spin-gap behavior observed in several high-{ital T}{sub {ital c}} systems.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6996455
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 69:13; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL MODELS
ELECTRON-ELECTRON INTERACTIONS
ELECTRONIC STRUCTURE
HIGH-TC SUPERCONDUCTORS
HUBBARD MODEL
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
MAGNETIC RESONANCE
MATHEMATICAL MODELS
MONTE CARLO METHOD
NUCLEAR MAGNETIC RESONANCE
PAIRING INTERACTIONS
PARTICLE INTERACTIONS
QUASI PARTICLES
RELAXATION TIME
RESONANCE
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE