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  • 1
    Electronic Resource
    Electronic Resource
    Coupling strength of charge carriers to spin fluctuations in high-temperature superconductors (1999)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 401 (1999), S. 354-356 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In conventional superconductors, the most direct evidence of the mechanism responsible for superconductivity comes from tunnelling experiments, which provide a clear picture of the underlying electron–phonon interactions. As the coherence length in conventional superconductors is large, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/43843
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  • 2
    Electronic Resource
    Electronic Resource
    Inelastic Scattering in Normal and Superconducting Raman Response (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 535-557 
    Details
    ISSN: 1572-9605
    Keywords: antiferromagnetic Fermi liquid ; inelastic scattering ; Raman effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We use the nearly antiferromagnetic Fermi liquid model to illustrate the effect of strongly anisotropic inelastic scattering on the electron Raman response. Both normal and superconducting states are considered, accounting fully for the momentum and frequency dependence of the resulting self-energy. Special attention is paid to the low frequency of the response and an ω to ω3 crossover in B 1g . By analogy to the infrared conductivity case, effective Raman scattering times are extracted, and their temperature and frequency dependences are studied and are compared with equivalent optical quantities. Impurities, within a unitary scattering approximation, are introduced and found to also have a strong characteristic signature on the Raman response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007864631911
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  • 3
    Electronic Resource
    Electronic Resource
    Optical conductivity of a superconductor withd x 2− y 2 symmetry (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 559-561 
    Details
    ISSN: 1572-9605
    Keywords: Optical conductivity ; D-wave, $$d_{x^2 - y^2 } $$ symmetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Using a simplified Eliashberg formulation in which we keep only that part of the susceptibility which is separable and of $$d_{x^2 - y^2 } $$ symmetry in the pairing channel and keep the isotropic part in the renormalization channel, we have calculated the ac conductivity in the superconducting state. At zero temperature, in the clean limit, we find a finite amount of absorption at any frequency, however small, although it is substantially reduced over its normal-state value. Besides this boson-assisted absorption, when impurities are added a new channel is opened up in which momentum is given up to the impurity system and absorption proceeds directly through the creation of a hole-particle pair. Born and unitary impurity scattering are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00728459
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  • 4
    Electronic Resource
    Electronic Resource
    D-wave superconductivity in the nearly antiferromagnetic fermi liquid (1995)
    Springer
    Journal of superconductivity 8 (1995), S. 401-404 
    Details
    ISSN: 1572-9605
    Keywords: dx2y2 ; tunnelling ; antiferromagnetic fluctuations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Self consistent calculations, based on the 2 dimensional Hubbard model, indicate that the nearly antiferromagnetic Fermi liquid may be a superconductor with dx2-y2 symmetry. The recent observation of a large anisotropy of the in plane penetration depth has been widely interpreted as evidence that a significant part of the condensate in YBa2Cu3O7−gd resides in the chains. This introduces orthorhombic symmetry. Calculations, which remain within a single tight binding band model but with different nearest neighbour hopping in a- and b-directions, can account for the penetration depth anisotropy and also explain the observed size of the D.C. Josephson current between YBa2Cu3O7−gd and Pb in c-axis tunnelling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00722815
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  • 5
    Electronic Resource
    Electronic Resource
    c-Axis Transport in a Normal-State Bilayer Cuprate and Relation to Pseudogap (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 305-315 
    Details
    ISSN: 1572-9605
    Keywords: High-T c superconductors ; transports ; c-axis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We study the effect of interband transitions on the normal-state optical conductivity, dc resistivity, and thermal conductivity along the c-axis, for a plane-chain bilayer cuprate coupled by a perpendicular hopping matrix element (t⊥). When t⊥ is small, the c-axis dc resistivity shows a characteristic upturn as the temperature is lowered, and the c-axis optical conductivity develops a pseudogap at low frequencies. As t⊥ is increased, intraband transitions start to dominate and a more conventional response is obtained. Similar pseudogap behavior is predicted in the thermal conductivity for which strong depression at low temperature is found. Analytical results for a simple plane-plane bilayer are also given, including the frequency sum rule of the optical conductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022600421541
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  • 6
    Electronic Resource
    Electronic Resource
    Spin Fluctuations in the Normal State Optical Conductivity (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 667-673 
    Details
    ISSN: 1572-9605
    Keywords: A.C. conductivity ; spin fluctuations ; oxides ; spectral density
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A theory is given for the structure present in the normal state optical conductivity that reflects the underlying spin fluctuations for a system in which the charge carriers interact through the antiferromagnetic spin susceptibility. Such an interaction involves strong momentum anisotropies and energy dependence that modulates the frequency dependence of the conductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007756220115
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  • 7
    Electronic Resource
    Electronic Resource
    Josephson current in an anisotropic d-wave model (1995)
    Springer
    Journal of superconductivity 8 (1995), S. 673-674 
    Details
    ISSN: 1572-9605
    Keywords: Josephson ; penetration ; orthorhombic ; d-wave
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract There should be no Josephson current between a CuO2 plane with a gap of d-wave symmetry and a conventional s-wave superconductor. Nevertheless such a current is observed to exist between YBCO and Pb although with a reduced magnitude. Penetration depth measurements have revealed a large anisotropy between a- and b-directions presumably due to the existence of the CuO chains. Using a simple anisotropic tight binding model in qualitative agreement with the measured penetration depths and a standard model for the spin susceptibility we obtain, on solution of the BCS gap equations, a gap function with a mainly d-wave symmetry but with a minor extended s-wave component. The resultant Josephson current for YBCO-Pb junctions is in good agreement with experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00727472
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  • 8
    Electronic Resource
    Electronic Resource
    Anisotropic transport scattering times for pure and dilute aluminium alloys (1975)
    Springer
    The European physical journal 19 (1975), S. 317-322 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ideal transport scattering times for pure Al are calculated and found to be very anisotropic. The anisotropy is a sensitive function of temperature. It is due to the Fermi surface, the multi-plane-wave character of the electronic wavefunctions, the Umklapp processes, as well as the phonon spectrum. In addition, for a magnesium impurity in Al we have computed the residual transport scattering times as well as the quasiparticle lifetimes which we then compare. The scattering time anisotropy gives rise to deviations from Matthiessen's rule in dilute alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01458879
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  • 9
    Electronic Resource
    Electronic Resource
    Superconductivity in amorphous Bi and Ga (1973)
    Springer
    Journal of low temperature physics 10 (1973), S. 551-571 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electron-phonon α2(ω)F(ω) has been measured by Chenet al. in films of amorphous Bi and Ga. This was accomplished by inversion of low-temperature quasiparticle tunneling data. From α2(ω)F(ω), the phonon renormalization of the electronic effective mass was calculated and was found to be considerably greater than it is in the case of the well-known strong-coupling superconductors Pb and Hg. These amorphous materials should, therefore, be ideal for a study of strong-coupling effects, i.e., deviations from BCS laws. In this paper, we present results of a theoretical study of select thermodynamic properties of these materials based on numerical solutions, at finite temperatures, of the Eliashberg equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655452
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of inelastic scattering on the conductivity of a $$d_{x^2 - y^2 }$$ superconductor (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 551-556 
    Details
    ISSN: 1573-7357
    Keywords: 74.20.Fg ; 74.25.Nf ; 74.72.−h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The large low temperature peak in the microwave conductivity observed in the oxides has been interpreted in terms of the collapse of the inelastic scattering time brought about by the gapping of the fluctuation spectrum responsible for superconductivity. It is shown that this gapping also affects the temperature dependence of the magnetic penetration depth and that it shows up clearly in the infrared conductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768443
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