Vortex state of Pb-substituted Bi2201 studied by in-plain resistivity measurements

D. Okamoto, K. Kudo, N. Okumura, T. Nishizaki, N. Kobayashi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In order to investigate the Pb concentration dependence of the irreversibility field Hirr in the Pb-substituted Bi2Sr2CuO6+δ (Bi2.12-xPbxSr1.88CuO6+ δ), we have measured the temperature dependence of the in-plane electrical resistivity in magnetic fields up to 15 T parallel to the c-axis. It is found that Hirr increases for x ≤ 0.27 with increasing x, while it remarkably decreases for x > 0.32. Striking feature is the enhancement of Hirr around x ∼ 0.27-0.32. A possible origin of the enhancement is the two-phase microstructures consisting of modulated and modulation-free domains. In such a case, the phase boundary of the microstructures works effectively as pinning centers for vortices, in contrast to the homogeneous modulated x = 0.18 and the homogeneous modulation-free x = 0.37. Our results strongly suggest the close relation between two-phase microstructures and the enhancement of Hirr.

Original languageEnglish
Pages (from-to)1278-1280
Number of pages3
JournalPhysica C: Superconductivity and its applications
Volume468
Issue number15-20
DOIs
Publication statusPublished - Sep 15 2008
Externally publishedYes

Keywords

  • Bi-based cuprates
  • In-plane electrical resistivity
  • Irreversibility field
  • Two-phase microstructures

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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