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VOLUME 53 (1991) | ISSUE 5 | PAGE 246
Expression describing the field dependence of the critical current in ceramic high-Tc superconductors over broad field and temperature ranges
The critical current Ic has been studied as a function of the magnetic field in a 1-2-3 ceramic with Tc = 89 К over the temperature range from 4.2 К up to Tc. The results can be described well by the expression Ic (H) = /, exp [ (H0/H)a]. The exponent has a value a = 0.49 + 0.06 and is independent of the temperature. The temperature dependence of the parameters J, and H() has been determined.