Mössbauer study of oxygen-related lattice instabilities in oriented 1-2-3 HTSC

Autor:	Chechersky, Vladimir
Zdroj:	Hyperfine Interactions; December 1994, Vol. 93 Issue: 1 p1711-1716, 6p
Abstrakt:	57Fe Mössbauer effect measurements as a function of temperature between 78 and 293 K in grain-aligned YBaCuO (Tc=89 K, ΔTc<2 K) with bothc∥γ andc⊥γ orientations revealed a sequence of anomalies in the recoilless fraction, center shift and linewidth of all57Fe quadrupole doublets in the host lattice. These anomalies are believed to arise due to antiferroelectric phase transitions driven by a nonlinear anharmonic vibrational motion of oxygen atoms in a breathing mode configuration. The results obtained are indicative of a possible coexistence of high-Tc superconductivity and antiferroelectricity in 1-2-3 ceramics.
Databáze:	Supplemental Index
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