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

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

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

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
Volume5
Issue number2 pt 2
Publication statusPublished - 1995 Jun
Externally publishedYes

Fingerprint

Fluxes
Superconducting materials
Liquid nitrogen
Magnetic flux
Scanning
Geometry
probes
profiles
liquid nitrogen
magnetic flux
field strength
critical current
current density
intervals
scanning
symmetry
geometry

ASJC Scopus subject areas

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

Cite this

Observation of flux distribution on the surface of MPMG-processed YBCO. / Higuchi, T.; Sakai, Naomichi; Murakami, Masato; Hashimoto, M.

In: IEEE Transactions on Applied Superconductivity, Vol. 5, No. 2 pt 2, 06.1995, p. 1818-1821.

Research output: Contribution to journalArticle

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