Crystal structure of the high-Tc superconductor Ba2YCu3O9−δ
T. Siegrist, S. Sunshine, D. W. Murphy, R. J. Cava, S. M. Zahurak
DOI 10.1103/PhysRevB.35.7137 · Physical Review B
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Abstract
The crystal structure of the high-Tc superconducting phase Ba2YCu3O9−δ(δ=2.0) has been determined by single-crystal x-ray diffraction. The compound crystallizes in an orthorhombic, oxygen-deficient perovskite superstructure with space group Pmmm, a=3.856(2) Å b=3.870(2) Å, and c=11.666(3) Å. The ordering of Ba and Y in a [Ba-Y-Ba]∞ sequence along the c axis is responsible for the tripled cell. Two [CuO2]∞ planes with copper in distorted square planar coordination are the key to conductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2YCu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure not reported | unknown |
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