Mossbauer-spectrum temperature-dependence anomalies of YBa2Cu3O9-y
Tsurin V. A. , Filippova N. P. , Sorkin A. M. , Kobelev L. Ya. , Nugaeva L L., Stepanov A. P.
Mossbauer spectroscopy has been used to study the compound YBa2Cu309 _ y (yzz2) with impurity 57Fe nuclei. This compound exhibits a superconductivity (Tc = 93 K). Measurements of the temperature dependence over the range 77-300 К reveal an anomalous behavior of the probability for the effect,/, (Τ), near Tc.