About the influence of the square-root van Hove singularity on the critical temperature of overdoped high-temperature superconductors
Conference
·
· International Journal of Modern Physics B
OSTI ID:6442810
- National Academy of Sciences of Ukraine, Kiev (Ukraine). Inst. of Physics
It is shown that the square-root van Hove singularity in the density of states [nu](E[sub F]) [approximately] (E[sub F] [minus] E[sub 0])[sup [minus]1/2], associated with the extended saddle-point singularities in the electron spectra of the cuprates, leads to a nonmonotonic dependence of the critical temperature [Tc] on the position of the Fermi level E[sub F] with respect to the bottom E[sub 0] of the saddle. As a result of cancellation of the divergency of [nu](E[sub F]) in the electron-electron coupling constant, renormalized due to the account of the strong coupling effects, [Tc] approaches zero in the limit E[sub F] [r arrow] E[sub 0]. This result contrasts that of the weak coupling approximation, which gives a finite value of [Tc] for E[sub F] [r arrow] E[sub 0]. The [Tc] on the concentration of doped holes, obtained in the strong coupling approximation, agrees qualitatively with the experimental data for the overdoped cuprate metal-oxides.
- OSTI ID:
- 6442810
- Report Number(s):
- CONF-980291--
- Conference Information:
- Journal Name: International Journal of Modern Physics B Journal Volume: 12:29-31
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
665411 -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
CHARGE CARRIERS
COPPER COMPOUNDS
COPPER OXIDES
COUPLING
ELECTRON SPECTRA
ENERGY LEVELS
FERMI LEVEL
HIGH-TC SUPERCONDUCTORS
HOLES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SINGULARITY
SPECTRA
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TYPE-II SUPERCONDUCTORS
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
665411 -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
CHARGE CARRIERS
COPPER COMPOUNDS
COPPER OXIDES
COUPLING
ELECTRON SPECTRA
ENERGY LEVELS
FERMI LEVEL
HIGH-TC SUPERCONDUCTORS
HOLES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SINGULARITY
SPECTRA
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TYPE-II SUPERCONDUCTORS