Abstract
We report on the synthesis and a structural investigation of two isomorphous variants of (Tl, Pb)Sr2(Ca, Tl)Cu2O7−y with different conductive properties. Our analysis of their tetragonal crystal structure (space groupP4/m m m) from X-ray powder data revealed characteristic features such as Tl off-centering, multiple cations and partly vacant oxygen sites. We found that substitution of about 35% Pb2+ for Tl3+ in the TlO monolayers of the structure, accompanied by replacement of about 23% Tl3+ for Ca2+ in the perovskite-like layers, changed normalconducting into superconducting behavior, with a transition to zero resistivity at 76 K; normalconducting behavior was found for 25% Pb on Tl sites. Subtle differences in the comparably high levels of doping of the Cu−O pyramidal sheets with holes are assumed to be responsible for the different conductive properties observed. We suggest that an excessive hole concentration turns the compound from superconducting into metallic behavior.
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Otto, H.H., Zetterer, T. & Renk, K.F. Preparation and structural investigation of normalconducting and high-T c superconducting (Tl, Pb)Sr2(Ca, Tl)Cu2O7−y . Z. Physik B - Condensed Matter 75, 433–438 (1989). https://doi.org/10.1007/BF01312519
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DOI: https://doi.org/10.1007/BF01312519