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Comment on: ``Using Ni Substitution and $^{17}$O NMR to Probe the Susceptibility $chi'(q)$ in Cuprates'' | | Dirk. K. Morr
; Joerg Schmalian
; Raivo Stern
; Charles P. Slichter
; | | Date: |
23 Oct 1997 | | Journal: | Phys. Rev. Lett. 80, 3662 (1998) DOI: 10.1103/PhysRevLett.80.3662 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Affiliation: | University of Illinois at Urbana-Champaign | | Abstract: | 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 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 of temperature $T$. Furthermore, they claim that a Lorentzian form of $chi’$ yields the same result. We will demonstrate that the Lorentzian and Gaussian form of $chi’$ actually yield qualitatively different results for the $^{17}$O line width and its dependence on $xi$. We show that their data when combined with $T_{2G}$ data from Takigawa require that $xi$ be T-dependent. Furthermore, assuming a Gaussian form of $chi’$ leads to the unphysical result that $xi$ increases with $T$. In contrast, the Lorentzian form of $chi’$ yields that $xi$ decreases with increasing $T$ and is thus fully compatible with the experimental results. | | Source: | arXiv, cond-mat/9710257 | | Services: | Forum | Review | PDF | Favorites | |
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