Abstract
Extraordinary efforts have recently been put into trying to understand the new class of high-temperature superconducting copper oxides discovered by Bednorz and Müller1. Here, we present high-resolution specific heat measurements on four different samples of YBa2Cu3O7–δ (YBCO) which reveal a new anomaly at 220 K (see also ref. 2). The strength of the anomaly as measured by its height is related to the size of the jump at the superconducting transition at 90 K. Specific heat measurements are sensitive and reliable volume probes of ordering phenomena in the bulk of solids; our results therefore establish that there are ordering phenomena taking place in YBCO at ∼220 K. These findings may be of importance for understanding reports of oxygen ordering3–5 and of various unstable superconducting transitions in the range from 150 K (ref. 6) to well above 200 K (ref. 7).
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
1. Bednorz, J. G. & Miiller, K. A. Z. Phys. B64, 189-193 (1986). 2. Lasgreid, T. el al. Phys. Rev. B (submitted). 3. Cava, R. J. et al. Nature 329, 423-425 (1987). 4. Ourmazd, A. & Spence, J. C. H. Nature 329, 425-427 (1987). 5. Renault, A., Burdett, J, K. & Pouget J.-P. /. Solid St. Chem. (submitted). 6. Bhargava, R. N., Herko, S. P. & Osborne, W. N. Phys. Rev. Lett. 59, 1468-1471 (1987). 7. Djurek, D. et al. Phys. Lett. A123, 481-484 (1987). 8. Monod, P. et al. J. Phys., Paris 48, 1369-1375 (1987) 9. Stokka, S. & Fossheim, K. J. Phys. E15, 123-127 (1982). 10. Kitazawa, K. et al. Jap. J. appl. Phys. 26, L748-L750 (1987). 11. Uher, C. & Kaiser, A. B. Phys. Rev. B (in the press). 12. Jezowski, A. et al. Phys. Lett. A122, 431-433 (1987). 13. Morelli, D. T., Heremans, J. & Swets, D. E. Phys. Rev. B36, 3917-3919 (1987). 14. Laegreid, T. et al. Phys. Scripta (in the press). 15. Capponi, .!. J. et al. Europhys. Lett. 3, 1301-1307 (1987). 16. Simon, A. Angew. Chem. int. Edn 6, 579-580 (1987). 17. Segre, C. U. et al. Nature 329, 227-229 (1987). 18. Jorgensen, J. D. et al. Phys. Rev. B36, 3608-3616 (1987). 19. Buttner, H. & Blumen, A. Nature 329, 700-701 (1987). 20. Phillips, J. C. Phys. Rev. Lett. 59, 1856-1859 (1987). 21. Cheong, S.-W. et al. Phys. Rev. B36, 3913-3916 (1987). 23. Yusheng, H. et al. J. Phys. F17, L243-L248 (1987). 24. Cannelli, C. et al. Phys. Rev. B (in the press). 25. Jacobs, L., Jose, J. V., Novotny, M. A. & Goldman, A. Europhys. Lett. 3, 1295-1300 (1987). Warren, W. W. Jr, Walstedt, R. E., Brennert, G. F., Espinosa, G. P. & Remeika, J. P. Phys. Rev. Lett. 59, 1860-1863 (1987).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Lægreid, T., Fossheim, K., Sandvold, E. et al. Specific heat anomaly at 220 K connected with superconductivity at 90 K in ceramic YBa2Cu3O7–δ. Nature 330, 637–638 (1987). https://doi.org/10.1038/330637a0
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/330637a0
This article is cited by
-
Pseudoelastic behavior in Y1?xPrxBa2Cu3Oy compounds
Journal of Low Temperature Physics (1993)
-
Observation of weakly adsorbed oxygen on Y5Ba6Cu11Oy
Journal of Superconductivity (1992)
-
High temperature crossover in paraconductivity of granular Y1Ba2Cu3O7-y
Zeitschrift f�r Physik B Condensed Matter (1991)
-
On the oxygen deficiency of high-T c Y1Ba2Cu3O7-� ceramics
Journal of Superconductivity (1991)
-
Analysis of specific heat anomalies of high-T c superconductors based on a two-carrier high-T c superconductor model
Journal of Superconductivity (1991)
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.