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Possible localized modes in the uniform quantum Heisenberg chains of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
A model of mobile bond defects is tentatively proposed to analyze the ``anomalies'' observed on the NMR spectrum of the quantum Heisenberg chains of ${\mathrm{Sr}}_{2}{\mathrm{CuO}}_{3}.$ A bond defect is a local change in the exchange coupling. It results in a local alternating magnetization (LAM), which, when the defect moves, creates …