Probing the susceptibility $χ'(q)$ in cuprates using Ni impurities

Details Probing the susceptibility $χ'(q)$ in cuprates using Ni impurities Probing the susceptibility $χ'(q)$ in cuprates using Ni impurities

1998-01-29

arxiv.org/abs/cond-mat/9801317v1

Phys. Rev. B 58, 11193--11196 (1998), err: Phys. Rev. B 59, 8984 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, RevTeX, 4 eps figures embedded in the text

Scientific paper

10.1103/PhysRevB.58.11193; 10.11

Recent NMR experiments on $YBa_2(Cu_{1-x}Ni_x)_3O_{6+\delta}$ (Bobroff et al. Phys. Rev. Lett. 79, 2117 (1997)) have shown that Ni impurities provide an important probe for the momentum dependence of the static spin susceptibility $\chi'(q)$. Combining the measurements of the $^{17}$O line width $\Delta \nu$ with those of the Gaussian relaxation time $T_{2G}$, we find that the magnetic correlation length $\xi$ must have a substantial temperature dependence. Using numerical simulations we present a detailed analysis of $\Delta \nu$ as a function of temperature and impurity concentration. For a Lorentzian shape of $\chi'(q)$ $\Delta \nu$ strongly depends on $\xi$, in contrast to the Gaussian form. This result together with the experimental finding that $\xi$ is temperature dependent rules out the Gaussian form of $\chi'(q)$.

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