The structure of the nonsuperconducting phase La3Ba3Cu6O(14 + x) and its relation to the high-T(c) superconductor YBa2Cu3O(7 - delta)

Details The structure of the nonsuperconducting phase La3Ba3Cu6O(14 + x) and its relation to the high-T(c) superconductor YBa2Cu3O(7 - delta) The structure of the nonsuperconducting phase La3Ba3Cu6O(14 + x) and its relation to the high-T(c) superconductor YBa2Cu3O(7 - delta)

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.328..328d&link_type=abstract

Nature (ISSN 0028-0836), vol. 328, July 23, 1987, p. 328, 329.

Physics

Condensed Matter

Superconductivity

37

Crystal Structure, High Temperature Superconductors, Mixed Oxides, Semiconductors (Materials), Barium Oxides, Copper Oxides, Diffractometers, Lanthanum Oxides, Temperature Dependence, Yttrium Oxides

Scientific paper

Time-of-flight neutron powder diffraction results are reported which confirm that the structure of La3Ba3Cu6O(14 + x) is isomorphous with the tetragonal variant of YBa2Cu3O(7 - delta). In particular, the copper coordination and calculated valencies of both compounds agree closely. The apparent contradiction of stoichiometries between these two phases is resolved by ordering of the large cations consistent with a formulation La(La/0.25/Ba/0.75/)2Cu3O(7 + 1/2x). Stoichiometries for both quenched and oxygen-annealed materials are in excellent agreement with those obtained by Er-Rakho et al. (1981), yielding more than seven oxygens per formula unit. The excess oxygen is located in the planes containing the chains of CuO4 planar groups in YBa2Cu3O(7 - delta). The present results extend the upper limit of oxygen stoichiometry from RA2Cu3O7 to RA2Cu3O7.2, but the materials studied here remain semiconducting down to 7 K. Thus, superconductivity appears to be confined to the range RA2Cu3O6.5 to RA2Cu3O7.

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