Abstract
The mechanical dissipation of (Bi0.9Pb0.1)2Sr2Ca2Cu3O10+y and YBa2Cu5O7-x ceramics were measured as a function of the angle θ between the orientation of the transverse magnetic field and the vibrating direction at fixed temperature and magnetic field with the vibrating reed technique. A relation between Q-1 (or f) and the angle θ, i.e. ΔQ-1 (or Δf) ∼ (Ha cos θ)1.5 was found and this indicated that only the magnetic field component parallel to the vibrating direction Ha cos θ gives rise to the enhancement of internal friction and resonant frequency in ceramic sample. The anisotropic deformation of flux-line-lattice is used to explain the observed results.
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