Abstract
A detailed comparison of the oxygen induced twin structure in large single crystal YBa 2 Cu 3 O 7− δ with the optical domain features observed in polarimetric microscopy has been carried out on a sample specially prepared to allow unambigous association of optical and transmission electron microscope features. This work has shown that the fine twinning seen in the TEM dominantly occurs in well defined lamellar regions which coincide with alternate domains in the optical microstructure. The region between these twinned lamellae (i.e. the other domains in the optical structure) are generally free from twins and are shown to be othorhombic using SAD in the electron microscope. This basic difference between adjacent optical domains is also observable in the optical properties of cleaved a-c or b-c faces of single crystals.
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