Antiferromagnetic spin-fluctuation effects on quasiparticle damping and superconductivity in high- T sub c materials

Journal Article · Wed May 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.10530· OSTI ID:5792807

Wermbter, S; Tewordt, L ^[1]

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1. Abteilung fuer Theoretische Festkoerperphysik, Universitaet Hamburg, Jungiusstrasse 11, D-2000 Hamburg 36, Federal Republic of Germany (DE)

First we calculate the random-phase-approximation (RPA) dynamic spin susceptibility of a two-dimensional (2D) Hubbard model for different band fillings and on-site Coulomb couplings {ital U}. The {bold q}-averaged spectral function for antiparamagnon exchange interaction starts linearly in frequency and then becomes almost constant, in agreement with nested Fermi-liquid theory.'' Employing this interaction function we solve the Migdal-Eliashberg equations for the self-energy of quasiparticles in the 2D tight-binding band. In the normal state the damping rate of quasiparticles varies approximately linearly with frequency above {omega}{sub {ital c}} and linearly in temperature above {ital T}{sup *}, where {omega}{sub {ital c}} and {ital T}{sup *} increase with decreasing degrees of nesting of the Fermi surface ({omega}{sub {ital c}} and {ital T}{sup *} denote the crossover values from quadratic to linear behavior). For a realistic choice of parameters we find qualitative agreement with inverse particle lifetimes obtained from infrared-reflectivity and photoemission data in the high-{ital T}{sub {ital c}} materials. Within the RPA we find that the {ital d}-wave and extended {ital s}-wave pairing interactions due to exchange of {ital one} antiparamagnon is not strong enough to explain high-{ital T}{sub {ital c}} behavior.

• OSTI ID: 5792807
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:13; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANGULAR MOMENTUM
ANTIFERROMAGNETISM
BISMUTH COMPOUNDS
BISMUTH OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CORRELATIONS
DAMPING
ENERGY
FLUCTUATIONS
HIGH-TC SUPERCONDUCTORS
MAGNETISM
OXIDES
OXYGEN COMPOUNDS
PARTICLE PROPERTIES
RANDOM PHASE APPROXIMATION
SELF-ENERGY
SPIN
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
VARIATIONS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES