Observation of compositional fluctuation by scanning superconducting quantum interference device (SQUID) microscope in superconducting La 1.8Sr0.2CuO4

Junpei Kasai, Noriaki Okazaki, Tetsuya Hasegawa, Yoshihiko Togawa, Takao Sasagawa, Jun Ichi Shimoyama, Kohji Kishio, Makoto Ohtani, Tomoteru Fukumura, Masashi Kawasaki, Hideomi Koinuma

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2 Citations (Scopus)

Abstract

In order to visualize spatial distributions of vortices strongly pinned in La1.8Sr0.2CuO4, we have performed scanning superconducting quantum interference device (SQUID) microscopic (SSM) measurements near TC. The obtained SSM images have revealed that stripe-shaped regions with higher Tc run in an arbitrary direction with respect to crystallographic axes. Vortices tend to align in a one-dimensional fashion, negotiating around the higher Tc regions. High-resolution electron probe micro-analysis confirmed that the spatial variation in Tc corresponds well to the modulation of Sr/La composition. We also found that small-angle grain boundaries with tilt angles of 1-3 degrees are less effective in trapping vortices, indicating that superconductivity is not degraded very much.

Original languageEnglish
Pages (from-to)L1327-L1329
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume43
Issue number10 B
DOIs
Publication statusPublished - 2004 Oct 15

Keywords

  • Compositional fluctuation
  • LaSr CuO
  • Overdoped regime
  • Pinning state
  • Scanning SQUID microscope

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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