Anomalous behavior of the temperature dependence of the parameters of the Mossbauer spectra of the superconducting ceramics YBa2Cu2.95Fe0.05O7-y
Cherepanov V. M. , Chuev M. A., Yakimov S. S., Goncharov V. Ya., Smirnov S. A.
The isomeric shift, quadrupole splitting, linewidth, and asymmetry parameter in the GoPdanskii-Karyagin effect were found to behave anomalously in the ceramic of the 1-2-3 composition near the transition to the superconducting state. The Mossbauer spectroscopy of the 57Fe impurity nuclei was used in the experiments.