Direct observation of nanometer-scale pinning sites in (Nd 0.33Eu0.20Gd0.47)Ba2Cu 3O7-δ single crystals

P. Das, M. R. Koblischka, S. Turner, G. Van Tendeloo, Th Wolf, M. Jirsa, U. Hartmann

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Abstract

We report on the observation of self-organized stripe-like structures on the as-grown surface and in the bulk of (Nd,Eu,Gd)Ba2Cu 3Oy single crystals. The periodicity of the stripes on the surface lies between 500-800 nm. These are possibly the growth steps of the crystal. Transmission electron microscopy investigations revealed stripes of periodicity in the range of 20-40 nm in the bulk. From electron back scattered diffraction investigations, no crystallographic misorientation due to the nanostripes has been found. Scanning tunneling spectroscopic experiments revealed nonsuperconducting regions, running along twin directions, which presumably constitute strong pinning sites.

Original languageEnglish
Article number37005
JournalEPL
Volume83
Issue number3
DOIs
Publication statusPublished - 2008 Aug 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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