Non-cubic layered structure of Ba(1-x)K(x)BiO3 superconductor

Details Non-cubic layered structure of Ba(1-x)K(x)BiO3 superconductor Non-cubic layered structure of Ba(1-x)K(x)BiO3 superconductor

2003-02-17

arxiv.org/abs/cond-mat/0302329v2

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, to be published in Physical Review B as a Rapid Communication

Scientific paper

10.1103/PhysRevB.67.140501

Bismuthate superconductor Ba(1-x)K(x)BiO3 (x=0.27-0.49, Tc=25-32K) grown by an electrolysis technique was studied by electron diffraction and high-resolution electron microscopy. The crystalline structure thereof has been found to be non-cubic, of the layered nature, and non-centrosymmetric, with the lattice parameters a ~ ap, c ~ 2ap (ap is a simple cubic perovskite cell parameter) containing an ordered arrangement of barium and potassium. The evidence for the layered nature of the bismuthate superconductor removes the principal crystallographic contradiction between bismuthate and cuprate high-Tc superconductors.

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