Abstract
We report the preparation of H y Bi 2Sr 2CaCu 2O 8+ δ single crystals hydrogenated electrochemically at ambient temperature up to a H-concentration y=1.0. The superconducting state of the crystals is studied by ac-susceptibility measurements and measurements of the dynamic magnetic relaxation. At high temperatures the superconductivity of the hydrogenated crystals exhibits granular features due to an inhomogeneous H-distribution. The geometrical barriers for the flux lines are partly suppressed in this temperature range so that the losses due to thermal depinning can be observed below the irreversibility line. The critical current density and the activation energy for thermal flux creep at low temperatures is only slightly deteriorated after hydrogenation, indicating that the superconducting ground state is not of granular type but rather homogeneous.
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