Abstract

Josephson plasma resonance measurements under magnetic fields parallel to the CuO 2 layers as functions of magnetic field, temperature, and microwave frequency have been performed in Bi 2Sr 2CaCu 2O 8+δ single crystals with doping range being from optimal to under-doped side. The feature of the resonance is quite unique and cannot be explained by the conventional understandings of the Josephson plasma for H ‖ c, that requires a new theory including coupling effect between Josephson vortex lattice and Josephson plasma.

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