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

Journal Article · Thu Feb 01 04:00:00 EST 1996 · Journal of Superconductivity

DOI:https://doi.org/10.1007/BF00728417· OSTI ID:269720

Trivedi, N; Randeria, M ^[1]

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1. Argonne National Lab., IL (United States)

The temperature scale T* at which the amplitude of the order parameter is formed is in general much higher than the T{sub c} at which phase coherence is established in short coherence length superconductors. Using quantum Monte Carlo simulations for the attractive Hubbard model the authors show that for a degenerate 2D system the spin and charge responses show qualitatively different behavior in the normal state in the temperature range T{sub c} < T< T*. They find that {Chi}{sub s} is strongly T-dependent while dn/d{mu} is independent of T. A pseudo-gap develops in the one-particle density of states and leads to anomalous behavior of the NMR relaxation rate 1/T{sub 1}T{approximately}{Chi}{sub s}(T) characteristic of spin gap behavior in the high-T{sub c} materials.

• OSTI ID: 269720
• Journal Information: Journal of Superconductivity, Journal Name: Journal of Superconductivity Journal Issue: 1 Vol. 9; ISSN JOUSEH; ISSN 0896-1107
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CHARGE CARRIERS
COHERENCE LENGTH
CORRELATIONS
HUBBARD MODEL
MONTE CARLO METHOD
ORDER PARAMETERS
SPIN
SUPERCONDUCTORS
TWO-DIMENSIONAL CALCULATIONS