Superconducting critical current of a single Cu2O4-plane in Bi2Sr2CaCu2O8+x single crystal
Abstract
By feeding current into the topmost Cu2O4-layer of a mesa etched into the surface of a Bi2Sr2CaCu2O8+x (BSCCO) single crystal, we measured its superconducting critical value from a sharp upturn or break in current-voltage characteristics of the mesas. From this, we estimate the sheet critical current density of a single Cu2O4 plane to be \ 0.3-0.7 A/cm at 4.5 K, corresponding to the bulk current density of 2-5\ MA/cm2. These values are among the largest ever measured for BSCCO single crystals, thin films and tapes.
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