High-resolution transmission electron microscopy studies of planar defects in the magnetic superconductor RuSr2EuCu2O8

Vasiliev, A. L.; Aindow, M.; Han, Z. H.; Budnick, J. I.; Hines, W. A.; Klamut, P. W.; Maxwell, M.; Dabrowski, B.
October 2004
Applied Physics Letters;10/11/2004, Vol. 85 Issue 15, p3217
Academic Journal
The defect structure in powders of the 1212-type phase RuSr2EuCu2O8 was investigated using high-resolution transmission electron microscopy. Both 90° domain boundaries and planar “faults” on {100} were observed. By comparing images of the faults with simulations for various plausible atomic models, it was shown that they are crystallographic shear planes with a displacement vector of R=(1/6)<332>. Such defects correspond to a local deficiency in Ru, Cu, and O, and give a local discontinuity in the Ru-O charge reservoir planes. As such, these defects may be responsible for the sensitivity of the superconducting and magnetic properties to processing conditions.


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