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  • 1
    Electronic Resource
    Electronic Resource
    Exchange enhancement of the electron-phonon pair interaction
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 235-240 (1994), S. 2129-2130 
    Details
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4534(94)92285-3
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  • 2
    Electronic Resource
    Electronic Resource
    A hidden pseudogap under the ‘dome’ of superconductivity in electron-doped high-temperature superconductors (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 422 (2003), S. 698-701 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The ground state of superconductors is characterized by the long-range order of condensed Cooper pairs: this is the only order present in conventional superconductors. The high-transition-temperature (high-Tc) superconductors, in contrast, exhibit more complex phase behaviour, which ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01488
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  • 3
    Electronic Resource
    Electronic Resource
    Raman scattering in unconventional superconductors: Vertex corrections in the Hubbard and Coulomb models (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 755-760 
    Details
    ISSN: 1573-7357
    Keywords: 74.20.−z ; 74-25.Nf ; 78.30.−j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electronic Raman spectrum for the experimentally relevant polarizations is calculated within a Hubbard-type model for anisotropic superconductors and compared with the results for the standard Coulomb model. The requirement of gauge invariance is shown to play an especially important role. The Raman A1g response depends rather sensitively on band structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768474
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  • 4
    Electronic Resource
    Electronic Resource
    Isotope effect in the hubbard model for d-wave superconductivity (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 639-644 
    Details
    ISSN: 1573-7357
    Keywords: 74.20. Mn ; 63.20. Kr ; 74.72.−h ; 74.25. Fy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have solved the generalized Eliashberg equations for the 2D Hubbard model with interactions due to exchange of antiferromagnetic spin fluctuations and harmonic phonons. We calculate the supression of Tc for d-wave superconductivity, the isotope exponent α, and the resitivity ϱ with different models for the phonon interaction α2F(q, ω). The smallest Tc supression and the largest α values are obtained for interactions which are enhanced atq = 0. At lower temperatures the spin-fluctuation interaction is strongly reduced by the phonon interaction due to feed-back effects. We compare our results with the experimental data on high-Tc superconductors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768456
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of Normal-State Pseudogap on Physical Quantities in Hubbard Model for Underdoped High-T c Cuprates (1998)
    Springer
    Journal of low temperature physics 111 (1998), S. 879-893 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We develop the strong-coupling theory of coexisting charge-density-wave (CDW) and superconductivityd-wave gaps within the framework of the FLEX (fluctuation exchange) approximation for the two-dimensional Hubbard model. For nested sections of the Fermi surface these equations reduce to the previous FLEX equations for superconductivity where the squared energy gap s 2 in the denominator of the Green's function is replaced by (φ s 2 + φ c 2 ) (here φs is the superconductivity and φ c the CDW gap). We solve these equations by taking for φ c a phenomenologicald-wave gap. The resulting neutron scattering intensity, spin-lattice relaxation rate 1/T1 , Knight shift, resistivity, and photoemission intensity are in qualitative agreement with the data on underdoped high-Tc cuprates. TheTc for superconductivity decreases and the crossover temperature T* for 1/T1Tincreases with increasing gap amplitude of φ c which is in qualitative agreement with the phase diagram for underdoped cuprates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022229425327
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  • 6
    Electronic Resource
    Electronic Resource
    Theory for underdoped high-Tc superconductors: effects of phase fluctuations (1999)
    Springer
    Journal of low temperature physics 117 (1999), S. 223-227 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In underdoped cuprates, T c is thought to be determined by Cooper pair phase fluctuations because of the small superfluid density n s . Experimentally, T c is found to scale with n s . The fluctuation-exchange approximation (FLEX) in its standard form fails to predict this behavior of T c since it does not include phase fluctuations. We therefore extend the FLEX to include them self consistently. We present results for T c[n s, x], where x is the doping.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022572322775
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of antiferromagnetic spin fluctuations on the phonon-mediated pair interaction in high-T c superconductors (1995)
    Springer
    Journal of low temperature physics 99 (1995), S. 527-529 
    Details
    ISSN: 1573-7357
    Keywords: 74.7e.−h ; 74.25. Kc ; 71.27.+a ; 63.20. Kr
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate the effect of electronic correlations on the phonon-mediated part of the pair interaction by including the effect of an exchange interaction U between the electrons in the calculation of the phonon frequencies and the electron-phonon vertices. We employ two RPA models: the first, consisting of a direct Coulomb interaction in addition to U, leads to softer phonons and an enhanced attractive s-wave phonon-induced electron-electron interaction while the second, a pure Hubbard model, yields the opposite effect. The weak-coupling selfconsistency equation for the order parameter in the 2D first Brillouin zone is solved for a tight-binding band. The change of Tc arises primarily from the change of the phonon frequencies rather than from the vertex renormalization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00752334
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  • 8
    Electronic Resource
    Electronic Resource
    The evaluation of a biphasic calcium phosphate ceramic for use in grafting long-bone diaphyseal defects (1987)
    Hoboken, NJ [u.a.] : Wiley-Blackwell
    Journal of Orthopaedic Research 5 (1987), S. 356-365 
    Details
    ISSN: 0736-0266
    Keywords: Hydroxyapatite ; Bone graft ; Nonunion ; Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The effectiveness of a sintered hydroxyapatite-tricalcium phosphate (HA-TCP) ceramic in bridging large diaphyseal defects in the canine ulna was studied. One-hundred percent morselized HA-TCP, a 50:50 mixture of morselized HA-TCP, and autogenous cancellous bone, and 100% autogenous cancellous bone were used to bridge 2.5-cm defects in the left ulnae of three groups of six dogs each. At 24 weeks the ulnae were explanted and studied by radiography, microradiography, mechanical testing, and histology. Pure HA/TCP was not osteoinductive, and four of six ulnae in this group progressed to a fibrous nonunion. The HA/TCP-cancellous bone mixture and pure cancellous bone were approximately equal in effect, leading to good callus formation at 4 weeks and strong bony union by 24 weeks, with no evidence of bioincompatibility. Morselized HA/TCP promises to be useful as a graft extender when mixed with autogenous cancellous bone.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jor.1100050307
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