Abstract
A special contactless technique in combination with the four-probe method allowed current-voltage characteristics in a very wide range of electric fields E∼10 -13÷10 -1 V/cm to be measured on a ring-shaped specimen of the Bi 2Sr 2Ca 2Cu 3O 8+δ ceramics at T=77 K and different magnetic fields. Experimental data are characterized with an S-like behavior that corresponds qualitatively to the characteristic of a single Josephson junction in the presence of thermal fluctuations. At low magnetic fields, a scaling behavior of magnetic field dependences of critical currents determined by different voltage levels has been revealed which fails on exceeding an intragrain lower critical field.
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