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High-temperature superconductivity; La₃Ba₃Cu₆O₁₄; YBa₂Cu₃O₇

Superconductivity is found in tetragonal La_3−xBa_3+xCu₆O_14+δ and La, Ba)_6−xSr_xCu₆O_14+δ even though they do not possess Cu-O chains or the K₂NiF₄ structure. Resistivity measurements confirm the occurrence of a transformation from chain-superconductivity to sheet-superconductivity in YBa₂Cu₃O_7−δ as δ is varied in the range 0.0–0.5.

A K Ganguli¹ L Ganapathi¹ K Sreedhar¹ R A Mohanram¹ P Ganguly¹ C N R Rao¹

1. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore - 560 012, India

Published

September 1987

Manuscript received

19 August 1987