Effect of normal-state pseudogap on physical quantities in Hubbard model for underdoped high-{Tc} cuprates

Journal Article · Mon Jun 01 00:00:00 EDT 1998 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1023/A:1022229425327· OSTI ID:642359

Dahm, T; Manske, D; Tewordt, L ^[1]

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1. Univ. Hamburg (Germany). Abteilung fuer Theoretische Festkoerperphysik

The authors develop the strong-coupling theory of coexisting charge-density-wave (CDW) and superconductivity d-wave gaps within the framework of the FLEX (fluctuation exchange) approximation for the two-dimensional Hubbard model. For nested sections of the Fermi surface these equations reduce to the previous FLEX equations for superconductivity where the squared energy gap {phi}{sub s}{sup 2} in the denominator of the Green`s function is replaced by ({phi}{sub 2}{sup 2} + {phi}{sub c}{sup 2}) (here {phi}{sub s} is the superconductivity and {phi}{sub c} the CDW gap). The authors solve these equations by taking for {phi}{sub c} a phenomenological d-wave gap. The resulting neutron scattering intensity, spin-lattice relaxation rate 1/T{sub 1}, Knight shift, resistivity, and photoemission intensity are in qualitative agreement with the data on underdoped high-{Tc} cuprates. The {Tc} for superconductivity decreases and the crossover temperature T{sub *} for 1/T{sub 1}T increases with increasing gap amplitude of {phi}{sub c} which is in qualitative agreement with the phase diagram for underdoped cuprates.

• OSTI ID: 642359
• Journal Information: Journal of Low Temperature Physics, Vol. 111, Issue 5-6; Other Information: PBD: Jun 1998
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
HIGH-TC SUPERCONDUCTORS
COPPER OXIDES
HUBBARD MODEL
SUPERCONDUCTIVITY
FERMI LEVEL
ENERGY GAP
TRANSITION TEMPERATURE
D WAVES