Observation of flux distribution on the surface of MPMG-processed YBCO

T. Higuchi, Naomichi Sakai, Masato Murakami, M. Hashimoto

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A macroscopic observation of a magnetic flux distribution on the surface of a superconducting bulk material was performed. First, a single-domained thin rectangular YBCO sample (10 mm×10mm×1mm) was field-cooled in liquid nitrogen. After the applied field was turned off, a field distribution in the area of 10mm×10mm was mapped by scanning the sample surface at intervals of 0.5mm using a Hall probe fixed to a XY-stage. The obtained field distribution was visualized into a three-dimensional distribution map and a two-dimensional contour graph. The overall shape of the field distribution had a four-fold symmetry reflected by the sample geometry. Next, assuming that the critical current density Jc is independent of the field strength, a field distribution generated by square current loops was calculated numerically. The intragranular Jc was estimated to be 2.6×104A/cm2 (77K, OT) by fitting the calculated profile to the measured profile. Finally, it is found that the measurement of field distributions on the surface of a superconductor using a Hall probe is applicable to an estimation of an intragranular Jc for a superconductor without destroying the samples.

Original languageEnglish
Pages (from-to)1818-1821
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2 pt 2
Publication statusPublished - 1995 Jun
Externally publishedYes


ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

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