Abstract
Measurements of magnetization versus magnetic field hysteresis for Bi 2Sr 2CaCu 2O x single crystal were performed in the temperature range from 4.2 to 25 K. Very large critical current density in a− b planes ( J c, ab ) of 1.8 × 10 6 A/cm 2 was observed at 4.2 K. The falloff of J c, ab with applied magnetic field was small at 4.2 K, while J c, ab decreased rapidly with increasing temperature. As for the anisotropy of this single crystal, we measured M- H hysterisis as a function of the angle between magnetic field and a− b plane. The results support very well Kes' model that Bi-based high- T c superconductors are composed of two-dimensional superconducting layers separated by normal conducting insertion layers.
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