Abstract
Time differential perturbed angular correlation measurements of the 133–482 keVγ-γ cascade of181Ta in Hf-doped YBa2Cu3O7−x are presented. The181Hf precurser nuclei are incorporated into the sample by thermal neutron irradiation. Two quadrupole interaction frequencies are observed in the as-irradiated sample:v Q1=161±10 MHz with intensityf 1=75%, asymmetry parameterη 1=0.32 and damping parameter Λ1=0.42, andv Q2=1108±40 MHz withf 2=25%,η 2=0.62, and Λ2=0.60. On annealing the sample in air at various temperaturesT a and quenching to room temperature,f 1 remained nearly constant forT a<600°C andv Q1 for all annealing temperatures indicating that these are insensitive to oxygen stoichiometry. This frequency is interpreted to be due to181Hf substitutingY sites. BeyondT a=600°C,f 1 increased and reached a constant value of 90% forT a=800°C. The value ofv Q2 showed a slight variation between 1086 and 1160 MHz, whilef 2 remained nearly constant at 25% forT a<600°C. This component is identified to be due to181Hf substituting Cu 1 sites in the Cu-O chains of YBCO. Above 600°Cv Q2 decreased and reached a value of 808 MHz beyond 750°C.
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Govindaraj, R., Premila, M., Gopalan, P. et al. TDPAC studies of Hf doped YBCO. Pramana - J. Phys 40, 391–398 (1993). https://doi.org/10.1007/BF02847499
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DOI: https://doi.org/10.1007/BF02847499