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Zeitschrift für Physik B Condensed Matter

, Volume 77, Issue 2, pp 197–199 | Cite as

Positron annihilation anomaly in the high-temperature superconductor YBa2Cu3O7−x

  • K. Kriŝtiaková
  • O. Ŝauŝa
  • J. Kriŝtiak
  • Ŝ. Jánoŝ
Article

Abstract

Positron annihilation measurements in the highT c superconductors YBa2Cu3O7−x have been performed. The Doppler broaded annihilation line has been used for determination of theS parameter as a function of temperature between 13 and 100 K. Measurements from 80 to 100 K were performed at close temperature intervals and showed a resonance like change inS in a narrow temperature range near the transition temperatureT c .Such behaviour ofS can be linked to an anomalous change in the lattice parameterc. The second decrease of theS parameter was observed below 30 K.

Keywords

Spectroscopy Neural Network State Physics Complex System Nonlinear Dynamics 
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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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • K. Kriŝtiaková
    • 1
  • O. Ŝauŝa
    • 1
  • J. Kriŝtiak
    • 1
  • Ŝ. Jánoŝ
    • 2
  1. 1.Institute of Physics of Electro-Physical Research CentreSlovak Academy of SciencesBratislavaCzechoslovakia
  2. 2.Faculty of Electrical EngineeringSlovak Technical UniversityBratislavaCzechoslovakia

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