Abrupt Change of Josephson Plasma Frequency at the Phase Boundary of the Bragg Glass in Bi2Sr2CaCu2O8+δ
Abstract
We report the first detailed and quantitative study of the Josephson coupling energy in the vortex liquid, Bragg glass and vortex glass phases of Bi2Sr2CaCu2O8+δ by the Josephson plasma resonance. The measurements revealed distinct features in the T- and H-dependencies of the plasma frequency ωpl for each of these three vortex phases. When going across either the Bragg-to-vortex glass or the Bragg-to-liquid transition line, ωpl shows a dramatic change. We provide a quantitative discussion on the properties of these phase transitions, including the first order nature of the Bragg-to-vortex glass transition.
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