Observation of twin boundary layers in pure and alloyed YBa2Cu3O7-δ

Zhu, Y.; Suenaga, M.; Xu, Youwen; Sabatini, R. L.; Moodenbaugh, A. R.
January 1989
Applied Physics Letters;1/23/1989, Vol. 54 Issue 4, p374
Academic Journal
Using an electron diffraction technique, the thicknesses of the (nonorthorhombic) twin boundary layers were measured for pure and alloyed YBa2(Cu1-xMx)3O7-δ. Boundary thickness varied from ∼0.7 nm for M=Ni, x=0.02, and δ[bar_over_tilde:_approx._equal_to]0 to ∼2.6 nm for M=Al, x=0.02, and δ[bar_over_tilde:_approx._equal_to]0, while it was ∼1.0 nm for a pure YBa2Cu3O7. High-resolution transmission electron imaging of similar specimens supports the existence of such twin boundary layers.


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