Tunneling, [alpha][sup 2][ital F]([omega]), and transport in superconductors: Nb, V, VN, Ba[sub 1[minus][ital x]]K[sub [ital x]]BiO[sub 3], and Nd[sub 1. 85]Ce[sub 0. 15]CuO[sub 4]
- Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616 (United States)
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
The electron-phonon contribution to the normal-state resistivity, [rho]([ital T]), has been calculated for the following conventional and oxide superconductors: Nb, V, VN, Ba[sub 1[minus][ital x]]K[sub [ital x]]BiO[sub 3], and Nd[sub 1.85]Ce[sub 0.15]CuO[sub 4] (NCCO). The resistivity formula developed from the Boltzmann equation by Ziman and Allen is used, incorporating measured physical constants. The calculations are novel in that they incorporate the electron-phonon spectral function, [alpha][sup 2][ital F]([omega]), for each material as obtained from superconducting tunneling measurements, the same function that yields the superconducting transition temperature [ital T][sub [ital c]]. New tunneling and transport data are presented for VN. Fits to the experimental [rho]([ital T]) are obtained over a wide temperature range with only two parameters: the plasma frequency [omega][sub [ital p]], which is in good agreement with independent measurements and a saturation resistivity, [rho][sub [ital s]], which manifests itself at high temperatures. We find that the [ital T]-dependent normal state [rho]([ital T]) is [ital completely] accounted for by phonon scattering in all materials except NCCO, where an additional electron-electron scattering term appears to be present. Apart from developing a consistent description of superconductivity and normal-state transport, several important issues are raised by the present work including indications of a conventional Fermi-liquid normal state in NCCO, insight into the importance of the shape of the Fermi surface in determining [rho]([ital T]), and the role of high-energy optical phonons in oxide and nitride superconductors.
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 6663800
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 51:6; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HIGH-TC SUPERCONDUCTORS
ELECTRIC CONDUCTIVITY
SUPERCONDUCTORS
BISMUTH OXIDES
CERIUM OXIDES
COPPER OXIDES
ELECTRON-PHONON COUPLING
FERMI LEVEL
NEODYMIUM OXIDES
NIOBIUM
POTASSIUM OXIDES
QUATERNARY ALLOY SYSTEMS
SPECTRAL FUNCTIONS
TRANSITION TEMPERATURE
TUNNEL EFFECT
VANADIUM
VANADIUM NITRIDES
ALKALI METAL COMPOUNDS
ALLOY SYSTEMS
BISMUTH COMPOUNDS
CERIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
COUPLING
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY LEVELS
FUNCTIONS
METALS
NEODYMIUM COMPOUNDS
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
POTASSIUM COMPOUNDS
RARE EARTH COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VANADIUM COMPOUNDS
360107* - Metals & Alloys- Superconducting Properties- (1992-)
360207 - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)