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Effect of the chemical inhomogeneity on the vortex lattice observed by the Bitter decoration technique in high-Tcsuperconductors

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/j.physc.2005.03.082
Keywords
  • Bi2212
  • Chemical Inhomogeneity
  • Magneto-Optical Imaging
  • Bitter Decoration
Disciplines
  • Chemistry
  • Physics

Abstract

Abstract We have performed local magnetization measurements on Bi 2SrCa 2Cu 2O 8+ y (Bi2212) single crystals grown by TSFZ method using Bitter decoration technique and MO imaging technique, which provides information of static vortex structures at the surface of superconductors. MO image revealed the presence of micron-scale inhomogeneities of critical currents, which is ascribed to the chemical fluctuation as analyzed by WDS. We could successfully observe nanometer-scale line defects with Bitter decoration technique performed at 65 K. The observed structure was largely disordered, presumably due to thermally activated motion during the decoration.

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