The atomic-scale origins of grain boundary superconducting properties

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Due to the extremely short coherence lengths of the high-{Tc} superconductors, defects such as grain boundaries are obvious barriers to the flow of supercurrent. Within a few months of the discovery of these materials, it was shown how the critical current dropped four orders of magnitude as the grain boundary misorientation increased from zero to 45{degree}. Even today, there is no quantitative understanding of this behavior. A qualitative understanding is however possible through atomic resolution Z-contrast imaging on YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} and SrTiO{sub 3} bicrystal grain boundaries, combined with bond-valence-sum analysis. The Z-contrast image of a YBa{sub 2}Cu{sub 3}O{sub ... continued below

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5 p.

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Pennycook, S.J.; Chisholm, M.F.; Buban, J.; Browning, N.D.; Prouteau, C. & Nellist, P.D. February 1, 1998.

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Due to the extremely short coherence lengths of the high-{Tc} superconductors, defects such as grain boundaries are obvious barriers to the flow of supercurrent. Within a few months of the discovery of these materials, it was shown how the critical current dropped four orders of magnitude as the grain boundary misorientation increased from zero to 45{degree}. Even today, there is no quantitative understanding of this behavior. A qualitative understanding is however possible through atomic resolution Z-contrast imaging on YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} and SrTiO{sub 3} bicrystal grain boundaries, combined with bond-valence-sum analysis. The Z-contrast image of a YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} low angle grain boundary shows the same kind of reconstructed dislocation cores as seen in SrTiO{sub 3}, containing reconstructions on both the Cu and Y/Ba sublattices. An image of an asymmetric 30{degree} boundary in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} shows the same units and unit sequence as expected for SrTiO{sub 3}. YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} boundaries are wavy because of their non-equilibrium growth process, and therefore mostly asymmetric in nature, although small segments have the symmetric structure. It seems reasonable to assume that boundaries of other angles will also have similar structures in these two materials.

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5 p.

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INIS; OSTI as DE98005588

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  • Microscopy and microanalysis 1998, Atlanta, GA (United States), 12-16 Jul 1998

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  • Other: DE98005588
  • Report No.: ORNL/CP--96745
  • Report No.: CONF-980713--
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 658215
  • Archival Resource Key: ark:/67531/metadc703076

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  • February 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Aug. 23, 2016, 2:54 p.m.

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Pennycook, S.J.; Chisholm, M.F.; Buban, J.; Browning, N.D.; Prouteau, C. & Nellist, P.D. The atomic-scale origins of grain boundary superconducting properties, article, February 1, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc703076/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.