Persistent currents in ceramic and evaporated thin-film toroids of Ba2YCu3O7

Gyorgy, E. M.; Grader, G. S.; Johnson, D. W.; Feldman, L. C.; Murphy, D. W.; Rhodes, W. W.; Howard, R. E.; Mankiewich, P. M.; Skocpol, W. J.
January 1988
Applied Physics Letters;1/25/1988, Vol. 52 Issue 4, p328
Academic Journal
We have demonstrated the existence of circumferential persistent currents in Ba2YCu3O7 ceramic toroids at 77 and 4.2 K and in thin films at 77 K. The field dependence of the critical current densities obtained from these persistent current measurements at 77 K is in fair agreement with that obtained from transport measurements. The persistent critical current densities for fields less than 10 G are 150 A/cm2 for the ceramic at 77 K and 105 A/cm2 for the thin film. A long term experiment showed that the resistivity is less than 3×10-18 Ω cm at 77 K.


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