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Zeitschrift für Physik B Condensed Matter

, Volume 78, Issue 2, pp 169–173 | Cite as

Observation of a diamagnetic signal up to 132 K in a Tl−Ca−Ba−Cu−O compound

  • T. Kàmàn
  • E. Lähderanta
  • S. Leppävuori
  • I. Halàsz
  • I. Dòdony
  • G. Zsolt
  • T. Porjesz
  • R. Laiho
  • A. Uusimäki
  • I. Kirschner
  • Gy. Kovács
Article

Abstract

Tl−Ca−Ba−Cu−O compounds of the nominal composition of (1, 1, 1, 1) have been prepared from different starting materials and with the same heat treatment process. During the investigation of their properties a diamagnetic signal has been found up to the temperature of 132 K. This hints at the existence of a certain material content distributed into discrete superconducting domains. The parameters of it reflect a superstructure of the (2, 2, 2, 3) and (2, 1, 2, 2) compositions having a time-dependent behaviour. On the basis of the signal levels at 132 K and 4.2 K, the quantity of the high temperature superconducting material is about 0.01% of the total one at liquid He temperatures.

Keywords

Spectroscopy Neural Network Heat Treatment State Physics Complex System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Kirschner, I., Halàsz, I., Sükösd, Cs., Porjesz, T., Kürti, J., Kovàcs, Gy. Korecz, L., Kàrmàn, T., Rozlosnik, N.S. Zsolt, G., Träger, T.: Phys. Lett. A130, 39 (1988)Google Scholar
  2. 2.
    Kirschner, I., Halàsz, I., Träger, T., Tòth, J., Kovàcs, Gy., Porjesz, T., Zsolt, G., Kàrmàn, T.: Z. Phys.-Condensed Matter73, 293 (1988)Google Scholar
  3. 3.
    Laiho, R., Aarnio, M., Heikkilä, L., Snellmann, H., Kirschner, I., Halàsz, I.: J. Microsc.152, 407 (1988)Google Scholar
  4. 4.
    Kovàcs, Gy., Kirschner, I., Laiàsz, I., Laiho, R., Porjesz, T., Tompa, K., Träger, T., Kàrmàn, T., Zsolt, G.: J. Less-Common Met.150, 229 (1989)Google Scholar
  5. 5.
    Kirschner, I., Halàsz, I., Kovàcs, Gy., Träger, T., Porjesz, T., Zsolt, G., Màtrai, J., Kàrmàn, T.: Advances in superconductivity. Kitazawa, K., Ishiguro, T. (eds.), p. 807 Berlin, Heidelberg, New York: Springer 1988Google Scholar
  6. 6.
    Halàsz, I., Kirschner, I., Porjesz, T., Kovàcs, Gy., Kàrmàn, T., Zsolt, G., Sükösd, Cs., Rozlosnik, N.S., Kürti, J.: Physica C153, 379 (1988)Google Scholar
  7. 7.
    Sheng, Z.Z., Hermann, A.M.: Nature332, 138 (1988)Google Scholar
  8. 8.
    Beyers, R., Parkin, S.S.P., Lee, V.Y., Nazzal, A.I., Savoy, R., Gorman, G., Huang, T.C., La Placa, S.: Appl. Phys. Lett.53, 432 (1988)Google Scholar

Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • T. Kàmàn
    • 1
  • E. Lähderanta
    • 2
  • S. Leppävuori
    • 3
  • I. Halàsz
    • 4
  • I. Dòdony
    • 5
  • G. Zsolt
    • 1
  • T. Porjesz
    • 1
  • R. Laiho
    • 2
  • A. Uusimäki
    • 3
  • I. Kirschner
    • 1
  • Gy. Kovács
    • 1
  1. 1.Department for Low Temperature PhysicsRoland Eötvös UniversityBudapestHungary
  2. 2.Wihuri Physical LaboratoryUniversity of TurkuTurkuFinland
  3. 3.Microelectronics LaboratoryUniversity of OuluOuluFinland
  4. 4.Central Research Institute for ChemistryBudapestHungary
  5. 5.Department of MineralogyRoland Eötvös UniversityBudapestHungary

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