New critical-state model for critical currents in ceramic high-Tc superconductors

H. Dersch; G. Blatter

doi:10.1103/PhysRevB.38.11391

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New critical-state model for critical currents in ceramic high-Tc superconductors

H. Dersch, G. Blatter

DOI 10.1103/PhysRevB.38.11391 · Physical Review B

T1

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Abstract

Critical-current and magnetization measurements are performed on a large number of ceramic superconductors of the YBa2Cu3O7 family. The results show that critical currents in present ceramics depend strongly on sample geometry and are, in fact, completely determined by self-field limitation. The strong magnetic field dependence leads to a general relation between critical current and magnetization which is experimentally found to be satisfied. A quantitative critical-state model based on an extension of Bean's theory is outlined which is able to predict transport and magnetic properties using microscopic current vs magnetic field relations. The underlying microscopic parameters are extracted from a comparison of the model calculation with measured transport and magnetization data.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure not reported	midpoint