Optical properties and Fermi-surface nesting in superconducting oxides

Journal Article · Fri Mar 01 04:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.5498· OSTI ID:5589356

Ruvalds, J; Virosztek, A ^[1]

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1. Physics Department, University of Virginia, Charlottesville, Virginia 22901 (USA)

Fermi-surface nesting is found to modify the electron-electron scattering and therefore yields an unusual variation of the optical reflectivity. At long wavelengths a Drude form of the dielectric function is derived with a relaxation rate for a nested Fermi liquid (NFL) that is linear in frequency for {omega}{gt}{ital T}. The corresponding Drude mass is also frequency and temperature dependent. Remarkably good fits to the reflectivity of YBa{sub 2}Cu{sub 3}O{sub 7}, Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}, and La{sub 2{minus}{ital x}}Sr{sub {ital x}}CuO{sub 4} are achieved using an on-site Coulomb interaction of intermediate strength. The static limit for the NFL conductivity is compatible with the temperature-dependent resistivity of the high-temperature superconductors. Self-energy and vertex corrections yield a long-wavelength susceptibility that is much weaker and different in structure from the response at the nesting wave vector {bold Q}, and the distinctions are relevant to the Raman spectrum. In cases of imperfect nesting, a crossover to conventional Fermi-liquid behavior is possible at a temperature {ital T}{sup *} determined by the quasiparticle orbits. Predictions for the optical response as a function of chemical composition are discussed, with attention to the anomalous resistivity of Nd{sub 2{minus}{ital x}}Ce{sub {ital x}}CuO{sub 4}.

• DOE Contract Number: FG06-91ER54113
• OSTI ID: 5589356
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:7; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BISMUTH COMPOUNDS
BISMUTH OXIDES
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHARGE CARRIERS
COPPER COMPOUNDS
COPPER OXIDES
CORRELATIONS
EFFECTIVE MASS
ELECTRON-ELECTRON INTERACTIONS
ENERGY LEVELS
FERMI LEVEL
FREQUENCY DEPENDENCE
HIGH-TC SUPERCONDUCTORS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LIFETIME
MASS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PARTICLE INTERACTIONS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
REFLECTIVITY
SUPERCONDUCTORS
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES