Title
Direct observation of nanometer-scale pinning sites in <tex>$(Nd_{0.33}Eu_{0.20}Gd_{0.47})Ba_{2}Cu_{3}O_{7-\delta}$</tex> single crystals Direct observation of nanometer-scale pinning sites in <tex>$(Nd_{0.33}Eu_{0.20}Gd_{0.47})Ba_{2}Cu_{3}O_{7-\delta}$</tex> single crystals
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Paris ,
Subject
Physics
Source (journal)
Europhysics letters. - Paris
Volume/pages
83(2008) :3 , p. 37005,1-37005,4
ISSN
0295-5075
ISI
000259022600032
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
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)Ba2Cu3Oy single crystals. The periodicity of the stripes on the surface lies between 500800 nm. These are possibly the growth steps of the crystal. Transmission electron microscopy investigations revealed stripes of periodicity in the range of 2040 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.
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