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The low magnetic field properties of superconducting bulk yttrium barium copper oxide-sintered versus partially melted material

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Abstract

A comparison of the low magnetic field properties of sintered (990°C) and partially melted samples (1050°C) has been performed. Changes in the microstructure produced by recrystallization from the melt result in a significant increase in flux pinning at 77 K. Low-frequency (10–100 Hz), low-a.c. magnetic field (0.01–9.0 Oe) a.c. susceptibility data show that gross changes in the a.c. loss component accompanies the observed changes in microstructure. The effects of applied d.c. magnetic fields (10–220 Oe) on the a.c. responses of these microstructures have also been probed. Data are analyzed and critically discussed in terms of current models appropriate for granular superconductors and in terms of older models appropriate for metallic alloys and compounds. Particular attention is given to published interpretations of the in-phase or loss component of the a.c. magnetic susceptibility and to the possible roles which minority phases and sample inhomogeneities may play in determining the detailed a.c. responses of these high-T coxides.

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Authors and Affiliations

  1. The Catholic University of America, 20064, Washington, D.C.

    R. A. Hein, H. Hojaji, A. Barkatt, H. Shafii & K. A. Michael

  2. Howard University, 20059, Washington, D.C.

    A. N. Thorpe & M. F. Ware

  3. NASA Goddard Space Flight Center, 20770, Greenbeit, Maryland

    S. Alterescu

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  1. R. A. Hein
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Hein, R.A., Hojaji, H., Barkatt, A. et al. The low magnetic field properties of superconducting bulk yttrium barium copper oxide-sintered versus partially melted material. J Supercond 2, 427–461 (1989). https://doi.org/10.1007/BF00627558

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