Structure refinements of superconducting Tl2Ba2CaCu2 O8 and Tl2Ba2Ca2 Cu3O10 from neutron diffraction data
D. E. Cox, C. C. Torardi, M. A. Subramanian, J. Gopalakrishnan, A. W. Sleight
DOI 10.1103/PhysRevB.38.6624 · Physical Review B
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Abstract
The structures of Tl2Ba2CaCu2 O8 and Tl2Ba2Ca2 Cu3O10 were refined from neutron-powder-diffraction data. The data for Tl2Ba2CaCu2 O8 were taken at 298 K, and the data for Tl2Ba2Ca2 Cu3O10 were obtained at both 150 and 13 K. The results are essentially in agreement with the structural refinements based on single-crystal x-ray-diffraction data and confirm the positional disorder of the oxygen atoms in the Tl-O planes. The low-temperature refinements for Tl2Ba2Ca2 Cu3O10 indicate that the symmetry remains tetragonal down to 13 K and that there is no significant structural change or discontinuity in the cell parameters through the superconducting critical temperature near 125 K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl2Ba2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 98 | Pressure not reported | onset |
| Tl2Ba2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 105 | Pressure not reported | onset |
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