• Interpretation of doping phenomena in high-Tc superconductors

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      https://www.ias.ac.in/article/fulltext/boms/014/04/1007-1013

    • Keywords

       

      Doping phenomena; indirect-exchange phenomena

    • Abstract

       

      On the basis of an indirect-exchange pairing mechanism of superconductivity we present a consistent interpretation of doping phenomena in both hole-doped as well as electron-doped high-Tc superconductors. We argue that in all these materials the unifying feature is the existence of a correlated narrow band of electron states formed due to doping. Numerous experimental evidences for the occurrence of such a band (reflectivity, thermoelectric power, electrical resistivity, X-ray absorption, point-contact tunneling etc.) now exist.

      Assuming the existence of such a band it was earlier shown that the indirect-exchange (superexchange) coupling between electrons in this band via closed-shell oxygen anions is attractive in the s-wave channel and leads to high-Tc superconductivity. Within the framework of this pairing mechanism, recent doping experiments (for both types of doping) can be given a unified interpretation. In addition, definitive predictions of the doping conditions under which critical temperatures are expected to enhance, are made.

    • Author Affiliations

       

      Leena Chandran1 Laurens Jansen1

      1. Physics Department, ETH-Hönggerberg, Zürich - CH-8093, Switzerland
    • Dates

       
  • Bulletin of Materials Science | News

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