Microstructures in a Twinned Single Crystal of Tetragonal La1.5Ba1.5Cu3O7.11

Abstract
Microstructures in a single crystal of tetragonal La1.5Ba1.5Cu3O7.11 grown by a flux method have been studied using high-resolution electron microscopy. The crystal is composed of twin domains with the a- and c-axes mutually interchanged. In each domain, a high density of stacking faults with a fault vector of 1/3[001] and with a fault plane nearly parallel to {101} have been observed. These stacking faults are considered to be related to a compositional fluctuation in the crystal.