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  • 1
    Electronic Resource
    Electronic Resource
    An Equation of State for High-Temperature Superconductor (1997)
    Springer
    Journal of superconductivity 10 (1997), S. 669-672 
    Details
    ISSN: 1572-9605
    Keywords: Equation of state ; bulk modulus ; cohesive energy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract In the present paper the expression of cohesive energy and the bulk modulus as a function of volume are formulated for high-T c copper oxide superconductors. The model employed consists of long-range electrostatic Coulomb interaction and short-range overlap repulsion. The short-range overlap potential is considered in the Born–Landé inverse power form. The model parameters of the Born–Landé model are calculated from the equilibrium condition and data of bulk modulus at room temperature. The computed values of pressure derivatives of bulk modulus at P=0 and the values of bulk modulus are found to be in very close agreement with experimental values for high-T c copper oxide and their nonsuperconducting parent compounds. It is also found that the quantity ΔU/U(V 0) of these compounds increases with increasing hydrostistic pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022614631380
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Effect of Biexciton on Cooper Pairing in High Tc Superconductors (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 441-443 
    Details
    ISSN: 1572-9605
    Keywords: Cooper pairing ; biexciton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007730105674
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    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
    Keywords: Critical temperature ; isotope effect ; high-T c superconductors ; electron–phonon ; electron–biexciton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022616417676
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    An equation of state of high-temperature superconductor (1997)
    Springer
    Journal of superconductivity and novel magnetism 10 (1997), S. 669-672 
    Details
    ISSN: 1557-1947
    Keywords: Equation of state ; bulk modulus ; cohesive energy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract In the present paper the expression of cohesive energy and the bulk modulus as a function of volume are formulated for high-T c copper oxide superconductors. The model employed consists of long-range electrostatic Coulomb interaction and short-range overlap repulsion. The short-range overlap potential is considered in the Born-Landé inverse power form. The model, parameters of the Born-Landé model are calculated from the equilibrium condition and data of bulk modulus at room temperature. The computed values of pressure derivatives of bulk modulus atP=0 and the values of bulk modulus are found to be in very close agreement with experimental values for high-T c copper oxide and their nonsuperconducting parent compounds. It is also found that the quantity ΔU/U(V o) of these compounds increases with increasing hydrostistic pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02471930
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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