Abstract
A 1201-phase superconductor (Pb0.5Cu0.5)SrLaCuO5±δ exhibiting a zero-resistance (R=0) state at 21 K has been synthesized. Neutron Rietveld refinement of the structure shows substantial oxygen disorder in the (Pb/Cu)-O(3) monolayer and excess occupancy of oxygen at the O(3) sites. The superconducting behavior of (Pb0.5Cd0.5)SrLaCuO5±δ , prepared under identical conditions, yields a value ofT c (R=0) equal to 24 K. The presence of extra oxygen appears to be responsible for trapping of holes within the rock-salt (Pb/Cu)-O(3).
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Sharma, R., Yakhmi, J.V., Sequeira, A. et al. Synthesis and neutron structural studies of (Pb/Cu)-1201 superconductor. J Supercond 8, 163–167 (1995). https://doi.org/10.1007/BF00732259
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DOI: https://doi.org/10.1007/BF00732259