Letter | Published:

Crystal structure of the high-temperature superconductor TI2Ba2CaCu2O8

Subjects

Abstract

High-temperature superconductivity has gained renewed attention following recent reports of the onset of superconductivity above 100 K in oxide systems containing copper, alkaline earths and bismuth1 or thallium2–4. The superconducting oxide in the Bi–Sr–Ca–Cu–O system has been identified as Bi2Sr3–xCaxCu2O8, and its structure comprises pairs of CuO2 sheets, interleaved by Ca(Sr), alternating with double bismuth-oxide layers5–7, Hazen et al.8 have identified two new superconducting phases, Tl2Ba2Ca2Cu3O10 (2223) and Tl2Ba2CaCu2O8 (2212), both with tetragonal or pseudotetragonal structures that are probably related to the structure of Bi2Sr3–xCaxCu2O8. Here we present X-ray diffraction data for a single crystal of the 2212 phase, which has an onset temperature of 112 K. The crystal structure, based on a body-centred tetragonal cell with a =3.8550(6) Å and c = 29.318(4) Å (space group I4/mmm), is essentially the same as that of Bi2Sr3–xCaxCu2O8 and comprises double copper-oxygen sheets alternating with double thallium-oxygen layers. There are Ca2+ cations between adjacent Cu–O sheets and Ba2+ cations between the Cu–O and Tl–O layers. The copper–oxygen chains present in YBa2Cu3O7 are absent in Tl2Ba2CaCu2O8.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

References

  1. 1

    Maeda, M., Tanaka, Y., Fukutomi, M. & Asano, T. Jap. J. appl. Phys. 27, L209–L210 (1988).

  2. 2

    Sheng, Z. Z. & Hermann, A. M. Nature 332, 55–58 (1988).

  3. 3

    Sheng, Z. Z. & Hermann, A. M. Nature 332, 138–139 (1988).

  4. 4

    Hazen, R. M. et al. Phys. Rev. Lett. (in the press).

  5. 5

    Subramanian, M. A. et al. Science 239, 1015–1017 (1988).

  6. 6

    Sunshine, S. A. et al. Phys. Rev. Lett. (submitted).

  7. 7

    Tarascon, J. M. et al. Phys. Rev. B (submitted).

  8. 8

    Hazen, R. M. et al. Phys. Rev. Lett. (submitted).

  9. 9

    Shannon, R. D. Acta crystallogr. A32, 751–767 (1976).

  10. 10

    Fueki, K. et al. in Chemistry of High-Temperature Superconductors (eds Nelson, D. L., Whittingham, M. S. & George, T. F.) 38–48 (American Chemical Society, Washington, 1987).

  11. 11

    Subramanian, M. A. et al. Science (in the press).

  12. 12

    Torardi, C. C. et al. in Chemistry of High-Temperature Superconductors (eds Nelson, A. L., Whittingham, M. S. & George, T. F.) 152–163 (American Chemical Society, Washington, 1987).

  13. 13

    Torardi, C. C. et al. Nature (submitted).

Download references

Author information

Rights and permissions

To obtain permission to re-use content from this article visit RightsLink.

About this article

Further reading

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.