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On the Possibility of s+d Wave Superconductivity Within a Two-Band Scenario for High T c Cuprates

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Abstract

A variety of different experimental results show substantial evidence that the order parameter in high-temperature superconducting copper oxides is not of pure d-wave symmetry, but that an s-wave component exists, which especially shows up in experiments that test the c-axis properties. These findings are modeled theoretically within a two-band model with interband interactions, where the superconducting order parameters in the two bands are allowed to differ in symmetry. It is found that the coupling of order parameters with different symmetries (s+d) leads to substantial enhancements of the superconducting transition temperature T c as compared to order parameters with only s-wave symmetry. An additional enhancement factor of T c is obtained from the coupling of the bands to the lattice where moderate couplings favor superconductivity while too strong couplings lead to electron (hole) localization and consequently suppress superconductivity.

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Authors and Affiliations

  1. Max-Planck-Institute for Solid State Research, Heisenbergstr. 1, D-70569, Stuttgart, Germany

    Annette Bussmann-Holder

  2. Institute of Physics, A. Mickiewicz University, 85 Umultowska St., 61-614, Poznan, Poland

    Roman Micnas

Authors
  1. Annette Bussmann-Holder
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  2. Roman Micnas
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Bussmann-Holder, A., Micnas, R. On the Possibility of s+d Wave Superconductivity Within a Two-Band Scenario for High T c Cuprates. Journal of Superconductivity 15, 321–325 (2002). https://doi.org/10.1023/A:1021005826860

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