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In a recent letter (PRL 79, 2117 (1997)), Bobroff et al. presented novel$^{17}$O NMR measurements for YBa_2(Cu_{1-x}Ni_x)_3O_{6+y} which offer a newprobe of the momentum dependence of the static spin susceptibility $\chi'(q)$.They analyzed the $^{17}$O line width by assuming a Gaussian form for $\chi'$,and came to the conclusion that the correlation length $\xi$ is independent oftemperature $T$. Furthermore, they claim that a Lorentzian form of $\chi'$yields the same result. We will demonstrate that the Lorentzian and Gaussianform of $\chi'$ actually yield qualitatively different results for the $^{17}$Oline width and its dependence on $\xi$. We show that their data when combinedwith $T_{2G}$ data from Takigawa require that $\xi$ be T-dependent.Furthermore, assuming a Gaussian form of $\chi'$ leads to the unphysical resultthat $\xi$ increases with $T$. In contrast, the Lorentzian form of $\chi'$yields that $\xi$ decreases with increasing $T$ and is thus fully compatiblewith the experimental results.Comment: 1 page, RevTeX, 1 eps figure embedded in the text, submitted to PR

physical review letters

Comment on ``Using Ni Substitution and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>O</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>17</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>NMR to Probe the Susceptibility<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>χ</mml:mi></mml:mrow><mml:mrow><mml:mo…

Comment on ``Using Ni Substitution andO17NMR to Probe the Susceptibilityχ