Persistent currents in ceramic and evaporated thin-film toroids of Ba 2YCu3O7

E. M. Gyorgy, G. S. Grader, D. W. Johnson, Leonard C Feldman, D. W. Murphy, W. W. Rhodes, R. E. Howard, P. M. Mankiewich, W. J. Skocpol

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Abstract

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.

Original languageEnglish
Pages (from-to)328-330
Number of pages3
JournalApplied Physics Letters
Volume52
Issue number4
DOIs
Publication statusPublished - 1988

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

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. (1988). Persistent currents in ceramic and evaporated thin-film toroids of Ba 2YCu3O7 . Applied Physics Letters, 52(4), 328-330. https://doi.org/10.1063/1.99454