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  • Digitale Medien  (3)
  • 1995-1999  (3)
  • isotope effect  (2)
  • Cooper pairing  (1)
  • 1
    Digitale Medien
    Digitale Medien
    A Possible Explanation of Critical Temperature and Isotope Effect Coefficient of High T c Cuprate Superconductors (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 663-665 
    Details
    ISSN: 1572-9605
    Schlagwort(e): Critical temperature ; isotope effect ; high-T c superconductors ; electron–phonon ; electron–biexciton
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The expressions for superconducting transition temperature (T c) and isotope effect coefficient (α) have been derived from a generalized integral gap equation for a strongly coupled superconductor, when electrons–phonons and electrons–biexcitons are simultaneously present in high-T c cuprate superconductors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1022616417676
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  • 2
    Digitale Medien
    Digitale Medien
    Cooper pair breaking and isotope effect coefficient variation in high-T c superconductors (1996)
    Springer
    Journal of superconductivity 9 (1996), S. 269-271 
    Details
    ISSN: 1572-9605
    Schlagwort(e): YBa2Cu3O7 ; pair breaking ; isotope effect
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The effect of pair breaking on the isotope effect coefficientα=−d lnT c/d lnM in La2−x Sr x CuO4 and Pr-, Ca-, and Zn-doped YBa2Cu3O7−x and EuBa2Cu3O7−x is studied using the generalized Abrikosov-Gorkov theory recently employed by Singh and Kishore for superconductivity. It is argued that the isotope effect coefficientα can be further enhanced, in agreement with experimental observations, by considering the dependence of the characteristic scattering timeτ s for Cooper pairs on the concentrationn of impurities (both magnetic and nonmagnetic) and the disorder ignored by them (J. Supercond. 8, 9 (1995).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00727546
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  • 3
    Digitale Medien
    Digitale Medien
    Effect of Biexciton on Cooper Pairing in High Tc Superconductors (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 441-443 
    Details
    ISSN: 1572-9605
    Schlagwort(e): Cooper pairing ; biexciton
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract In this paper, we have modified the Cooper theory by considering a biexcitonic attractive interaction for high T c superconductors. We have developed an expression for (2Δ/K B T c) as a function of phonon and biexciton mediated coupling constants. For the sake of simplicity, we use a two-square-well potential model (electron–phonon and electron–biexciton). The calculated values of (2Δ/K B T c) show good agreement with experimental values.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1007730105674
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