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X-ray scattering from a tetragonal single crystal of YBa₂(Cu0.955{Al}0.045)₃{O}₇$ shows diffuse streaking in [110] directions about the Bragg peaks. Through a quantitative calculation using a coupled concentration wave, static displacement wave approach, we show that this is essentially attributable to the shear displacement field produced by a disordered oxygen array on the Cu(1)-O ``chain'' plane. We observe pronounced short-range chain order (local orthorhombic fluctuations) whose correlation range is considerably greater than the superconducting coherence length. This suggests that on a scale relevant for superconductivity the (local) orthorhombicity remains important in this tetragonal structure.
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Jiang et al. (1991) studied this question.
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