Domain and crystal structure of superconducting Ba2YCu3O8−δ at 40 and 100 K by single-crystal neutron diffraction
G. J. McIntyre, A. Renault, G. Collin
DOI 10.1103/PhysRevB.37.5148 · Physical Review B
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Abstract
The domain and crystal structure of orthorhombic Ba2YCu3O8−δ (δ≃1.30) has been investigated at 40 and 100 K by single-crystal neutron diffraction. As the crystals were cooled from the tetragonal growth phase the reciprocal lattice split quadruply due to interchange of the orthorhombic a and b axes on a macroscopic scale and to microscopic twinning about (110) planes. Recording the diffraction pattern on a multidetector allowed some separation of the individual orthorhombic reflections. The intensity ratios of the individual reflections of some split peaks are shown to be particularly sensitive to the relative occupations of the oxygen sites in the plane between pairs of closest Ba atoms, and confirm that the oxygen lies on just one site. Large thermal parameters are observed for the copper and oxygen atoms in the chains of corner-linked CuO4 groups.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2YCu3O8-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| Ba2EuCu3O8-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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