Comment on: ``Using Ni Substitution and ${}^{17}$O NMR to Probe the Susceptibility ${\chi }^{\prime }(q)$ in Cuprates''

Dirk. K. Morr, Joerg Schmalian, Raivo Stern +1

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 new probe of the momentum dependen…