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Localization effects on magnetic excitations, Coulomb repulsion, and critical temperature in a quasi-3D superconductor

Abstract

Using the Eliashberg equations for superconductivity in a quasi-3D high-temperature super-conductor, taking into consideration the¯q-dependent phonon-mediated electron-electron interaction, the effect of the disordered magnetic correlations, and Coulomb repulsion affected by disorder, we calculated the expression for the critical temperature. The phonon and the magnetic kernels have a logarithmic divergence and the critical temperature differs from the McMillan form. The Coulomb repulsion in the presence of disorder has been estimated. The disordered magnetic correlations can decrease the critical temperature or can suppress the superconductivity. The effect of various parameters on the decrease of the critical temperature has been analyzed.

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Grosu, I., Dobrin, R. Localization effects on magnetic excitations, Coulomb repulsion, and critical temperature in a quasi-3D superconductor. J Supercond 9, 529–534 (1996). https://doi.org/10.1007/BF00723526

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Key words

  • Localization
  • magnetic excitations
  • Coulomb repulsion
  • superconductor