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.
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Kriŝtiaková, K., Ŝauŝa, O., Kriŝtiak, J. et al. Positron annihilation anomaly in the high-temperature superconductor YBa2Cu3O7−x . Z. Physik B - Condensed Matter 77, 197–199 (1989). https://doi.org/10.1007/BF01313663
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DOI: https://doi.org/10.1007/BF01313663