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  • 78.47.+p  (1)
  • 81.15.Gh  (1)
  • Metal-insulator transition  (1)
  • 1
    ISSN: 1432-0630
    Keywords: 81.15.Gh ; 82.30.Lp ; 79.60.-i
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Boron-carbon thin films have been successfully deposited on Si (111) from the synchrotron radiation induced decomposition of the nido-2,3-diethyl-dicarbahexaborane, (CH3CH2)2C2B4H6. There are indications that molecular precursor states to complete dissociation exist, and that dissociation is the rate limiting step. As with deposition of boron from decaborane, there is an activation barrier to dissociation of diethylcarborane on Si (111). The composition of the growing film, as determined by the boron to carbon ratio, is strongly dependent upon the boron concentration at the surface of the substrate. The boron concentration of the film increases with increasing film thickness.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 94 (1994), S. 255-259 
    ISSN: 1434-6036
    Keywords: 74.30.Gn ; 74.70.Vy ; 78.47.+p ; 84.40.Cb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The polarized reflectance of thea-b plane of single-domain Bi2Sr2CaCu2O8 crystals is anisotropic above and belowT c . The normal-state infrared conductivity is higher forE‖a whereas the high-frequency conductivity is higher alongb, particularly for transitions associated with the Bi−O layers. BelowT c there is a definite anisotropy to the far-infrared absorption, with a finite absorption forE‖b down to ≈20 meV. This anisotropy of thea-b plane could be due either to anisotropy of the superconducting gap or to anisotropy of the midinfrared component to the conductivity.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1572-9605
    Keywords: Metal-insulator transition ; Electronic structure ; High-temperature superconductors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Doping Bi2Sr2Ca1Cu2O8+y with Co causes a superconductor-insulator transition. We study correlations between changes in the electrical resistivity ρab(T) and the electronic bandstructure using identical single crystalline samples. For undoped samples the resistivity is linear in temperature and has a vanishing residual resistivity. In angle resolved photoemission these samples show dispersing band-like states. Co-doping decreases Tc and causes and increase in the residual resistivity. Above a threshold Co-concentration the resistivity is metallic (dρab/dT〉0) at room temperature, turns insulating below a characteristic temperature Tmin and becomes superconducting at even lower temperature. These changes in the resistivity correlate with the disappearance of the dispersing band-like states in angle resolved photoemission. We show that Anderson localization caused by the impurity potential of the doped Co-atoms provides a consistent explanation of all experimental features. The coexistance of insulating (dρab/dT 〈0) normal state behavior and superconductivity indicates that the superconducting ground state is formed out of spatially almost localized carriers.
    Type of Medium: Electronic Resource
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