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  • 11
    Electronic Resource
    Electronic Resource
    High-temperature superconductivity: The roles of soft-phonon driven structural phase transitions and biphonon-electron coupling (1992)
    Springer
    The European physical journal 86 (1992), S. 183-186 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For the first time, fully self-consistent soft phonon data, associated with the tetragonal-orthorhombic structural transition in the high-temperature superconductor La2−x Sr x CuO4, are used to solve Eliashberg equations. It is found that the electron-phonon coupling constant is stronglyx- and temperature-dependent. The superconducting transition temperatureT c follows the experimentalx-dependence but does not exceed 28 K. The higherT c values observed are attributed to nonlinear electronphonon interactions, due to high oxygen ion polarizability, which producebiphonon resonances and bound states and significantly increaseT c .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313824
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  • 12
    Electronic Resource
    Electronic Resource
    Ferroelectrics (1987)
    Springer
    The European physical journal 68 (1987), S. 335-338 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A diatomic linear chain model is used to describe the dynamical properties of displacive type ferroelectric compounds. For these materials the non-bondingp-orbitals of the chalcogen ions play an essential role, which is taken into account by assuming a nonlinear fourth-order polarizability at the chalcogen-ion lattice site. Within the self-consistent phonon approximation soft modes, phonon dispersion curves, phonon anomalies and related quantities can be calculated for all temperatures. Going beyond the self-consistent phonon approximation, the model yields, in the continuum limit, interesting new solutions such as periodic non-linear waves, kinks, which describe the statics and dynamics of ferroelectric domain walls, and pulse solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01304249
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  • 13
    Electronic Resource
    Electronic Resource
    Gap distribution and multigap-coupling in highT c 's (1993)
    Springer
    The European physical journal 92 (1993), S. 149-154 
    Details
    ISSN: 1434-6036
    Keywords: 70 ; 74.72-h ; 74.62-c
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Gap coupling interaction is a necessary consequence if a superconducting system has a gap distribution, as found for the high-T c oxocuprates, since the interaction has to result in a single critical temperatureT c . This paper shows with the help of BCS gap-coupling equations and values of gap distribution, including gap weights from experiments, thatT c values as observed are easily achievable with reasonable diagonal and off-diagonal coupling coefficients. Of course our phenomenologically derived coupling coefficients have to be verified from purely theoretical grounds. Most importantly, it is found that the highest gap contributes dominantly toT c in spite of its low weight. Predictions for a point-contact tunneling spectroscopy are made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01312170
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  • 14
    Electronic Resource
    Electronic Resource
    Enhancement ofT c in BCS theory extended by interband two-phonon exchange (1993)
    Springer
    The European physical journal 90 (1993), S. 183-186 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Band crossing and hybridization effects on superconductivity are investigated within a weak coupling limit of an extended BCS theory. Two-phonon modiated attractive two-band (p−d) interactions induce anisotropic coupled energy gaps, enhancement of the transition temperatureT c , and a material-dependent isotope effect. The individual gap tok B T c ratios deviate from the usual BCS value but their average recovers approximately the usual value. Effects on ultrasonic attenuation and coherence lengths are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02198152
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  • 15
    Electronic Resource
    Electronic Resource
    Cooperative gap coupling in high-T c superconductivity (1993)
    Springer
    The European physical journal 91 (1993), S. 271-276 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A unified approach to superconductivity is presented using natural extensions of weak coupling BCS theory. Multiphonon-multiband interactions cause a multigap opening atT c , with cooperative pairing in all bands incorporated via interband interactions. Strong increases inT c are found due to interband-induced gap coupling. Model calculations for the experimentally observed gap distribution are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01344055
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  • 16
    Electronic Resource
    Electronic Resource
    Competing and Cooperative Effects of Spin, Charge, and Phonon Degrees of Freedom in HTSC (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 773-776 
    Details
    ISSN: 1572-9605
    Keywords: spin ; charge ; phonon degrees of freedom ; HTSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The phase diagram of high-T c superconducting copper oxides (HTSC) exhibits an unusual complexity which is, at present, beyond any microscopic modeling. Motivated by very recent experimental findings—(i) a giant isotope effect on T* and (ii) doping-dependent phonon anomalies and “extra” modes—the role played by the lattice is reinvestigated and the consequences arising for the striped phase are discussed. By including nonlinear higher-order phonon–phonon and density–density interactions in the Hamiltonian, an isotope effect on T* is obtained, as well as substantial q-dependent phonon anomalies, where both effects are strongly doping dependent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007882719172
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  • 17
    Electronic Resource
    Electronic Resource
    Preface (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 663-663 
    Details
    ISSN: 1572-9605
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007829508269
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  • 18
    Electronic Resource
    Electronic Resource
    From t–J to JT: Spin-Charge-Phonon-Coupling in High Temperature Superconductors (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 19-21 
    Details
    ISSN: 1572-9605
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Superconducting copper-oxides are modeled by a two-band Hubbard type modelHamiltonian which explicitly includes on-site and intersiteelectron–phonon interactions. The effects of both on theantiferromagnetic and superconducting state properties are investigated. Inthe antiferromagnetic regime the on-site electron–phonon interactionsinduce a squeezing of the band energies and an isotope effect on theantiferromagnetic transition temperature T N is predicted. In thesuperconducting phase the intersite electron–phonon couplings gainimportance and induce a large increase in T c especially if the difference inband energies is large.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007748931231
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  • 19
    Electronic Resource
    Electronic Resource
    Preface (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 1-1 
    Details
    ISSN: 1572-9605
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007728029414
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  • 20
    Electronic Resource
    Electronic Resource
    Ferroelectricity and superconductivity (1989)
    Weinheim : Wiley-Blackwell
    Advanced Materials 1 (1989), S. 89-90 
    Details
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19890010305
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