PAC studies of hyperfine interactions of181Ta in YBa2Cu3O7-δ and of140Ce in La2CuO4 and La1.85Sr0.15CuO4 |
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Authors: | Z. Z. Akselrod G. A. Denisenko B. A. Komissarova L. N. Kryukova G. K. Ryasny A. A. Sorokin L. G. Shpin’kova |
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Affiliation: | (1) Institute of Nuclear Physics, Moscow State University, 117234 Moscow, USSR;(2) Institute of Crystallography, Academy of Sciences of the USSR, Leninskii Pr. 59, 117333 Moscow, USSR |
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Abstract: | Results of TDPAC studies of hyperfine interaction in high temperature superconducting ceramics are reported. The γ-ray cascade of 329–487 keV in140Ce excited in the decay of140La in La2-xSrxCuO4 samples (x=0 and 0.15), and 133–482 keV cascade in181Ta excited in the decay of181Hf in YBa2Cu3O7-δ samples were used. The procedure of introducing radioactive181Hf into the ceramics is described and indirect evidence for the occupation of Cu sites by the181Hf-181Ta probe is presented. |
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