Abstract
The Josephson plasma resonance in single crystalline Bi 2Sr 2CaCu 2O 8+δ has been investigated at a microwave frequency of 35 GHz in a TE 102 cavity as functions of external magnetic field ( H ext //c- axis) and sample dimension L in the ab-plane. A sharp resonance is observed in E rf //c , whereas multi-peaks are found in H rf //ab . The former is independent of the sample dimension, while the latter shifts to higher fields as the sample size L is reduced, and disappears when L≤ L c . The size dependence of the resonance field observed in H rf //ab can be explained by the strong dispersion relation of the transverse Josephson plasma, and the size independent resonance can be described by the longitudinal Josephson plasma as predicted by the recent theory of Josephson plasma by Tachiki et al.
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