Vanishing of superconductivity at a transition from itinerant-electron to small-polaron conduction in nominal Bi4−xPbx(Sr3Ca)Ca2−xYxCu4O16
- 26 December 1988
- journal article
- conference paper
- Published by AIP Publishing in Applied Physics Letters
- Vol. 53 (26) , 2695-2697
- https://doi.org/10.1063/1.100548
Abstract
Lead was found to substitute for bismuth on cosubstitution of yttrium for calcium in nominal Bi4(Sr3Ca)Ca2Cu4O16. Variations with x in the lattice parameters, the oxidation parameter determined by iodometric titration, and the temperature dependence of resistance have revealed a correlation of the variation of Tc and c parameter versus x with a metal‐to‐semiconductor transition. It is argued that this correlation manifests a transition from itinerant‐electron to small‐polaron conduction. This conclusion is related to the observed shifts in c‐axis oxygen that appear to be associated with a transition from antiferromagnetic semiconductor to a superconductor in other copper‐oxide systems.Keywords
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