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Finite-size effects in the quasi-one-dimensional quantum magnets<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">CuO</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>,</mml:mo><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.99</mml:mn></mml:mrow></mml:…
We studied the finite-size effects on the magnetic behavior of the quasi-one-dimensional spin $S=\frac{1}{2}$ Heisenberg antiferromagnets ${\text{Sr}}_{2}{\text{CuO}}_{3}$, ${\mathrm{Sr}}_{2}{\mathrm{Cu}}_{0.99}{M}_{0.01}{\mathrm{O}}_{3}$ ($M=\text{Zn}$ and Ni), and ${\text{SrCuO}}_{2}$. Magnetic susceptibility data were analyzed to estimate the concentration of chain breaks due to extrinsically doped defects and/or due to slight oxygen off-stoichiometry. We show that the …