Abstract
Two dimensional x-ray images of a multilayered bismuth high-temperature superconductor (HTS) together with reciprocal-space simulation have shown how unit cells are distorted to form ``supercells,'' the structural modulation consisting of multiple unit cells with incommensurate modulation period in a HTS. Strain induced by the multilayered structure alters the lattice mismatch between bismuth and perovskite blocks, resulting in increased supercell distortion described by the amplitude in the modulation wave. While oxygen content affects the modulation period of the supercell, lattice mismatch dominates the displacement of each atom from its position in the perfect crystal to construct the distorted structure, the supercell.
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