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[en] We have measured the microwave dissipation at 10 GHz through the imaginary part of the susceptibility, χ'', in a Bi2Sr2CaCu2O8 single crystal in an external static magnetic field H parallel to the c-axis at various fixed temperatures. The characteristics of χ''(H) exhibit a sharp step at a field Hstep, strongly dependent on the amplitude of the microwave excitation hac. The characteristics of hac vs. Hstep, reveal the behavior expected for the magnetic-field dependence of Josephson coupling. (orig.)
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