Microstructure of Pb2Sr2ACu3O8 superconductors: New structures and superstructures
R. Hull, J. M. Bonar, L. F. Schneemeyer, R. J. Cava, J. J. Krajewski, J. V. Waszczak
DOI 10.1103/PhysRevB.39.9685 · Physical Review B
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Abstract
We report a detailed study of the microstructure of the new class of high-Tc superconductors, Pb2Sr2ACu3O8, by transmission electron microscopy and diffraction. Several new structural and superstructural variants are observed for A=Eu+Sr, Dy+Ca/Sr or Dy+Sr. Approximately 50% of the individual crystals analyzed displayed weak violation of the c centering present in x-ray macroscopic structure determination, and superstructure variants with modulation vectors parallel to a and/or b were observed in ∼25% of Eu+Sr the crystals analyzed. In the A=Dy+Sr structures only, structure modulations were observed along [110] and [11¯0] directions.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb2Sr2(Eu,Sr)Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | unknown |
| Pb2Sr2(Dy,Ca,Sr)Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | unknown |
| Pb2Sr2(Dy,Sr)Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | unknown |
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