Structures of the superconducting oxides Tl2Ba2CuO6 and Bi2Sr2CuO6
C. C. Torardi, M. A. Subramanian, J. C. Calabrese, J. Gopalakrishnan, E. M. McCarron, K. J. Morrissey, T. R. Askew, R. B. Flippen, U. Chowdhry, A. W. Sleight
DOI 10.1103/PhysRevB.38.225 · Physical Review B
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Abstract
The structures of Tl2Ba2CuO6 and Bi2Sr2CuO6 have been solved and refined from single-crystal x-ray diffraction data. The structures are essentially the same and have single Cu-O sheets separated by either Tl-O or Bi-O double layers. The Tl2Ba2CuO6 structure is tetragonal with a=3.87 Å and c=23.24 Å, and there are strictly flat Cu-O sheets. Bi2Sr2CuO6 has a lower-symmetry structure which may be approximated with an orthorhombic cell with a=5.36 Å, b=5.37 Å, and c=24.62 Å; however, this ignores superstructure reflections along both the a and c axes. The Tl-O layers are much more strongly bound to each other than are the Bi-O layers; thus, better conduction along the c axis is expected for Tl2Ba2CuO6 relative to Bi2Sr2CuO6. Superconducting transition temperatures of 9 and 90 K were observed for Bi2Sr2CuO6 and Tl2Ba2CuO6, respectively.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl2Ba2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| Bi2Sr2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9 | Pressure not reported | unknown |
| Tl2Ba2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 55 | Pressure not reported | onset |
| Tl2Ba2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 84 | Pressure not reported | onset |
| Tl2Ba2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 79 | Pressure not reported | zero_resistance |
| Tl2Ba2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
| Tl2Ba2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 83 | Pressure not reported | zero_resistance |
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