Abstract
In order to determine the dielectric properties of the bound charges (soft dipoles) in superconducting YBa 2 Cu 3 O 7-δ (δ < 0.15) we have extended conventional ultrasound experiments to the determination of the dispersion and absorption of the sound-induced rf magnetic field. In contrast to the ultrasonic behaviour, the temperature dependence of the dispersion and absorption of the sound-induced rf magnetic field shows pronounced anomalies. It is shown that these experimental findings are highly indicative for displacive ferroelectric phase transitions appearing in the temperature range of 150 K < T < 180 K and in the vicinity of the superconducting transition temperature. The possible connection between ferroelectricity and high temperature superconductivity is also discussed.
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