Abstract
Abstract Investigations on the temperature dependence in the range from 4 to 100 K of the ultrasonic attenuation α ( T , B ) and the relative change Δ v ( T , B )/ v of the sound velocity for various applied magnetic fields have been made. The ultrasonic attenuation α was measured by the pulse-echo technique and the relative change of the sound velocity Δ v / v by a phase-comparison method. The measurements serve for the examination of the elastic behaviour of the flux line lattice (FLL) of pure and Zn doped YBCO crystals and YBCO/Ag composites. These crystals are important for applications as permanent magnets. In the framework of the thermally assisted flux flow model (TAFF) the activation energies U ( B ) were deduced from the ultrasonic data.
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