Abstract
Mossbauer measurements were performed in the temperature range from 77 to 300K. Temperature-dependent57Fe Mossbauer recoil-free fraction in high-Tc superconducting phase of Bi-system display cvidence of a softening in lattice vibrations, which appears at T<150K as a precursor effect to the onset of superconductivity. The mean-square displacement (Inf) and the mean-square velocity (IS) of Fe3+ ion are both characterized by Debyc temperature OD=320K within higher temperature range.
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