Abstract
We study the microwave response perpendicular to the superconducting layers of high temperature superconductors in a wide range of temperatures and fields. A novel microwave response,i.e. Josephson plasma resonance, shows up in the superconducting state of Bi2Sr2CaCu2O8+δ. This resonance enable us to measure the magnitude of interlayer phase coherence quantitatively. Josephson plasmon is shown to interact strongly with the vortices. Therefore it provides a new powerful tool to probe the vortex state. The vortex state of high temperature superconductors is discussed in the light of the interlayer phase coherence.
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