Microwave-induced instability observed in in a static magnetic field
Physique de la Matière Condensée, Ecole Normale
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2 Department of Applied Physics, The University of Tokyo Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
Accepted: 5 January 2001
We have measured the microwave dissipation at 10 GHz through the imaginary part of the susceptibility, , in a Bi2Sr2CaCu2O8 single crystal in an external static magnetic field H parallel to the c-axis at various fixed temperatures. The characteristics of 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.
PACS: 74.25.Nf – Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.) / 74.72.Hs – Bi-based cuprates / 74.50.+r – Proximity effects, weak links, tunneling phenomena and Josephson effects
© EDP Sciences, 2001