TITLE

Origin of weak-link behavior of grain boundaries in superconducting cuprates and pnictides

AUTHOR(S)
Deutscher, Guy
PUB. DATE
March 2010
SOURCE
Applied Physics Letters;3/22/2010, Vol. 96 Issue 12, p122502
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Superconducting cuprates and pnictides composed of CuO2 or AsFe planes, respectively, with intercalated insulating layers, are at the crossroads of three families of crystalline solids: Metals, doped Mott insulators, and ferroelectrics. The metallic and doped insulator approaches to high temperature superconductivity are essentially electronic ones, while in ferroelectrics atomic displacements play a key role. We show that pairing by contraction of in-plane Cu–O (or As–Fe) bonds, as proposed by the bond contraction pairing model, is prevented by the tensile strain generated by dislocations at grain boundaries. This explains why weak link behavior already sets in at low angle boundaries.
ACCESSION #
48837251

 

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