On σ–Δ anticorrelation in high-temperature superconductors - On σ–Δ anticorrelation in high-temperature superconductors - HRI-US
On σ–Δ anticorrelation in high-temperature superconductors
Recently, the application of the BCS-type pairing mechanism to a Bi-cuprate system has been questioned based on the experimentally observed anticorrelation between the values of the superconducting gap Δ and normal conductivity σ . Here we analyze similar data available for the lead-based alloys Pb1−xBix(x≪1), which definitely belong to the BCS-type superconductors. Our analysis reveals exactly same kind of anticorrelation. In view of our results, the anticorrelation arguments against the applicability of the BCS-type model to the cuprate high-Tc superconductors should be relaxed.