Magneto optical characterizations of flux dynamics in Nd-Ba-Cu-O bulk superconductors

M. Zamboni, S. I. Yoo, T. Higuchi, K. Waki, S. Koishikawa, Masato Murakami

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We investigated the magnetic flux dynamics of Nd-Ba-Cu-O (NdBCO) bulk superconductors produced by the Oxygen-Controlled-Melt-Growth (OCMG) method using the Magneto-Optical (M-O) technique at various low temperatures. An external magnetic field was applied both parallel (H∥c) and perpendicular (H ⊥ c) to the c-axis of the sample. While for H∥c the flux motion was isotropic, for H ⊥ c anisotropic penetration and expulsion of the flux lines were directly visualized. In the configuration H ⊥ c the flux lines were observed to move in and out the sample predominantly parallel to the a-b planes. The flux behavior was also correlated to the microstructure. Particularly, the microcracks along the basal plane were found to provide a channel for easy flux motion. The anisotropic behavior of the flux front reflects the anisotropy in the critical current density Jc. The different components of Jc were independently calculated from the M-O data directly analyzing the magnetic induction profiles. These Jc values were consistent with those estimated interpreting the magnetization hysteresis measurements within the framework of the extended Bean model.

Original languageEnglish
Pages (from-to)218-227
Number of pages10
JournalPhysica C: Superconductivity and its Applications
Volume281
Issue number2-3
Publication statusPublished - 1997 Aug 1
Externally publishedYes

Fingerprint

Superconducting materials
Fluxes
expulsion
Electromagnetic induction
magnetic induction
microcracks
Microcracks
Magnetic flux
magnetic flux
Hysteresis
Magnetization
critical current
Anisotropy
penetration
hysteresis
Magnetic fields
current density
Oxygen
magnetization
microstructure

Keywords

  • Anisotropy
  • Flux dynamics
  • Iron-garnet films
  • Magneto optical technique
  • Nd-Ba-Cu-O superconductors

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Magneto optical characterizations of flux dynamics in Nd-Ba-Cu-O bulk superconductors. / Zamboni, M.; Yoo, S. I.; Higuchi, T.; Waki, K.; Koishikawa, S.; Murakami, Masato.

In: Physica C: Superconductivity and its Applications, Vol. 281, No. 2-3, 01.08.1997, p. 218-227.

Research output: Contribution to journalArticle

Zamboni, M, Yoo, SI, Higuchi, T, Waki, K, Koishikawa, S & Murakami, M 1997, 'Magneto optical characterizations of flux dynamics in Nd-Ba-Cu-O bulk superconductors', Physica C: Superconductivity and its Applications, vol. 281, no. 2-3, pp. 218-227.
Zamboni, M. ; Yoo, S. I. ; Higuchi, T. ; Waki, K. ; Koishikawa, S. ; Murakami, Masato. / Magneto optical characterizations of flux dynamics in Nd-Ba-Cu-O bulk superconductors. In: Physica C: Superconductivity and its Applications. 1997 ; Vol. 281, No. 2-3. pp. 218-227.
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