The effect of chemical inhomogeneities on the pinning properties of Bi2212 single crystals

Noriko Chikumoto, Kimiyasu Furusawa, Masato Murakami

研究成果: Article査読

2 被引用数 (Scopus)


We have carried out a detailed characterization of chemical inhomogeneities in Bi2212 single crystals grown by a floating zone method. According to the chemical analyses using WDS, there are two types of inhomogeneities; one with linear structures extending toward the a-axis, and another with sheet-like structures that lying along the a-axis. The line defects relate to compositional inhomogeneities, such as Ca-enriched or Ca-deficient regions, with widths ranging from a few nanometres to micrometres and lie parallel to the crystal a-axis. From the observation of local flux line arrangement using a Bitter decoration technique and a magneto-optical imaging technique, the flux line arrangement at the defect region is largely affected by the type of nonstoichiometry involved. We found that the flux-line lattice at the Ca-enriched region has a hexagonal order with small scattering, while that at the Ca-deficient region is amorphous. On the other hand, the crystal with sheet-like inhomogeneities showed a 'zebra-like' flux penetration and trapping behaviour. This result suggests that the samples are composed of two kinds of regions with completely different pinning properties.

ジャーナルSuperconductor Science and Technology
出版ステータスPublished - 2004 2月 1

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 凝縮系物理学
  • 金属および合金
  • 電子工学および電気工学
  • 材料化学


「The effect of chemical inhomogeneities on the pinning properties of Bi2212 single crystals」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。