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VOLUME 50 | ISSUE 3 | PAGE 135
Low-field microwave absorption in bismuth-based high-Tc superconducting single crystals: threshold vortex-lattice effects
A threshold in the magnetic field has been observed for several characteristic effects in the low-field absorption by high~rc single crystals. A signal of a new type corresponds to the threshold field in the microwave absorption spectrum. The appearance of the new signal in the low-field absorption and of effects which involve a threshold in the magnetic field is linked with a transition from an individual pinning of vortices to a collective pinning.

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