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The anomalous temperature dependence of the vibrational behaviour and quadrupole splitting of Fe nuclei in Bi4Sr3Ca3Cu3.92Fe0.08Oy

Lattice softening is found to occur at about 30 K in Bi4Sr3Ca3Cu3.92Fe0.08O16.38. The average quadrupole splitting of Fe nuclei decreases with increasing temperature between 40 K and 297 K and its reduction follows a T3/2 law. Below 30 K the rapid drop in the average quadrupole splitting is closely related to lattice softening. The lattice vibrational behaviours of Fe-doped Bi-4334 and Fe-doped Bi-2212 are quite different.